+
−# This Source Code Form is subject to the terms of the Mozilla Public
+
−# License, v. 2.0. If a copy of the MPL was not distributed with this
+
−# file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
−
+
−# This file defines static prefs, i.e. those that are defined at startup and
+
−# used entirely or mostly from C++ and/or Rust code.
+
−#
+
−# The file is separated into sections, where each section contains a group of
+
−# prefs that all share the same first segment of their name -- all the "gfx.*"
+
−# prefs are together, all the "network.*" prefs are together, etc. Sections
+
−# must be kept in alphabetical order, but prefs within sections need not be.
+
−#
+
−# Basics
+
−# ------
+
−# Any pref defined in one of the files included here should *not* be defined
+
−# in a data file such as all.js; that would just be useless duplication.
+
−#
+
−# (Except under unusual circumstances where the value defined here must be
+
−# overridden, e.g. for some Thunderbird prefs. In those cases the default
+
−# value from the data file will override the static default value defined
+
−# here.)
+
−#
+
−# Please follow the existing prefs naming convention when considering adding a
+
−# new pref, and don't create a new pref group unless it's appropriate and there
+
−# are likely to be multiple prefs within that group. (If you do, you'll need to
+
−# update the `pref_groups` variable in modules/libpref/moz.build.)
+
−#
+
−# Definitions
+
−# -----------
+
−# A pref definition looks like this:
+
−#
+
−#   - name: <pref-name>                    # mandatory
+
−#     type: <cpp-type>                     # mandatory
+
−#     value: <default-value>               # mandatory
+
−#     mirror: <never | once | always>      # mandatory
+
−#     do_not_use_directly: <true | false>  # optional
+
−#     include: <header-file>               # optional
+
−#     rust: <true | false>                 # optional
+
−#
+
−# - `name` is the name of the pref, without double-quotes, as it appears
+
−#   in about:config. It is used in most libpref API functions (from both C++
+
−#   and JS code).
+
−#
+
−# - `type` is one of `bool`, `int32_t`, `uint32_t`, `float`, an atomic version
+
−#   of one of those, `String` or `DataMutexString`. Note that float prefs are
+
−#   stored internally as strings. The C++ preprocessor doesn't like template
+
−#   syntax in a macro argument, so use the typedefs defined in
+
−#   StaticPrefsBase.h; for example, use `RelaxedAtomicBool` instead of
+
−#   `Atomic<bool, Relaxed>`.
+
−#
+
−# - `value` is the default value. Its type should be appropriate for
+
−#   <cpp-type>, otherwise the generated code will fail to compile. A complex
+
−#   C++ numeric expressions like `60 * 60` (which the YAML parser cannot treat
+
−#   as an integer or float) is treated as a string and passed through without
+
−#   change, which is useful.
+
−#
+
−# - `mirror` indicates how the pref value is mirrored into a C++ variable.
+
−#
+
−#   * `never`: There is no C++ mirror variable. The pref value can only be
+
−#     accessed via the standard libpref API functions.
+
−#
+
−#   * `once`: The pref value is mirrored into a variable at startup; the
+
−#     mirror variable is left unchanged after that. (The exact point at which
+
−#     all `once` mirror variables are set is when the first `once` mirror
+
−#     variable is accessed, via its getter function.) This is mostly useful for
+
−#     graphics prefs where we often don't want a new pref value to apply until
+
−#     restart. Otherwise, this update policy is best avoided because its
+
−#     behaviour can cause confusion and bugs.
+
−#
+
−#   * `always`: The mirror variable is always kept in sync with the pref value.
+
−#     This is the most common choice.
+
−#
+
−#   When a mirror variable is present, a getter will be created that can access
+
−#   it. Using the getter function to read the pref's value has the two
+
−#   following advantages over the normal API functions.
+
−#
+
−#   * A direct variable access is faster than a hash table lookup.
+
−#
+
−#   * A mirror variable can be accessed off the main thread. If a pref *is*
+
−#     accessed off the main thread, it should have an atomic type. Assertions
+
−#     enforce this.
+
−#
+
−#   Note that Rust code must access the mirror variable directly, rather than
+
−#   via the getter function.
+
−#
+
−# - `do_not_use_directly` indicates if `_DoNotUseDirectly` should be appended to
+
−#   the name of the getter function. This is simply a naming convention
+
−#   indicating that there is some other wrapper getter function that should be
+
−#   used in preference to the normal static pref getter. Defaults to `false` if
+
−#   not present. Cannot be used with a `never` mirror value, because there is
+
−#   no getter function in that case.
+
−#
+
−# - `include` names a header file that must be included for the pref value to
+
−#   compile correctly, e.g. because it refers to a code constant. System
+
−#   headers should be surrounded with angle brackets, e.g. `<cmath>`.
+
−#
+
−# - `rust` indicates if the mirror variable is used by Rust code. If so, it
+
−#   will be usable via the `static_prefs::pref!` macro, e.g.
+
−#   `static_prefs::pref!("layout.css.font-display.enabled")`.
+
−#
+
−# The getter function's base name is the same as the pref's name, but with
+
−# '.' or '-' chars converted to '_', to make a valid identifier. For example,
+
−# the getter for `foo.bar_baz` is `foo_bar_baz()`. This is ugly but clear,
+
−# and you can search for both the pref name and the getter using the regexp
+
−# /foo.bar.baz/. Suffixes are added as follows:
+
−#
+
−# - If the `mirror` value is `once`, `_AtStartup` is appended, to indicate the
+
−#   value was obtained at startup.
+
−#
+
−# - If the `do_not_use_directly` value is true, `_DoNotUseDirectly` is
+
−#   appended.
+
−#
+
−# Preprocessor
+
−# ------------
+
−# Note finally that this file is preprocessed by preprocessor.py, not the C++
+
−# preprocessor. As a result, the following things may be surprising.
+
−#
+
−# - YAML comments start with a '#', so putting a comment on the same line as a
+
−#   preprocessor directive is dubious. E.g. avoid lines like `#define X 3 #
+
−#   three` because the ` # three` will be part of `X`.
+
−#
+
−# - '@' use is required for substitutions to occur. E.g. with `#define FOO 1`,
+
−#   `FOO` won't be replaced with `1` unless it has '@' chars around it.
+
−#
+
−# - Spaces aren't permitted between the leading '#' and the name of a
+
−#   directive, e.g. `#ifdef XYZ` works but `# ifdef XYZ` does not.
+
−#
+
−# Please indent all prefs defined within #ifdef/#ifndef conditions. This
+
−# improves readability, particular for conditional blocks that exceed a single
+
−# screen. But note that the leading '-' in a definition must remain in the
+
−# first column for it to be valid YAML.
+
−
+
−#ifdef RELEASE_OR_BETA
+
−#define IS_NOT_RELEASE_OR_BETA false
+
−#else
+
−#define IS_NOT_RELEASE_OR_BETA true
+
−#endif
+
−
+
−#ifdef NIGHTLY_BUILD
+
−#define IS_NIGHTLY_BUILD      true
+
−#define IS_NOT_NIGHTLY_BUILD  false
+
−#else
+
−#define IS_NIGHTLY_BUILD      false
+
−#define IS_NOT_NIGHTLY_BUILD  true
+
−#endif
+
−
+
−#if defined(NIGHTLY_BUILD) || defined(MOZ_DEV_EDITION)
+
−#define IS_NIGHTLY_OR_DEV_EDITION true
+
−#else
+
−#define IS_NIGHTLY_OR_DEV_EDITION false
+
−#endif
+
−
+
−#ifdef MOZILLA_OFFICIAL
+
−#define IS_NOT_MOZILLA_OFFICIAL false
+
−#else
+
−#define IS_NOT_MOZILLA_OFFICIAL true
+
−#endif
+
−
+
−#ifdef EARLY_BETA_OR_EARLIER
+
−#define IS_EARLY_BETA_OR_EARLIER true
+
−#define IS_NOT_EARLY_BETA_OR_EARLIER false
+
−#else
+
−#define IS_EARLY_BETA_OR_EARLIER false
+
−#define IS_NOT_EARLY_BETA_OR_EARLIER true
+
−#endif
+
−
+
−#ifdef ANDROID
+
−#define IS_ANDROID true
+
−#define IS_NOT_ANDROID false
+
−#else
+
−#define IS_ANDROID false
+
−#define IS_NOT_ANDROID true
+
−#endif
+
−
+
−#ifdef XP_WIN
+
−#define IS_XP_WIN true
+
−#define IS_NOT_XP_WIN false
+
−#else
+
−#define IS_XP_WIN false
+
−#define IS_NOT_XP_WIN true
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "accessibility."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: accessibility.accesskeycausesactivation
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: accessibility.monoaudio.enable
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: accessibility.browsewithcaret
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: accessibility.AOM.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: accessibility.ARIAReflection.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether form controls and images should be focusable with mouse, in content
+
−# documents.
+
−#
+
−# This matches historical macOS / Safari behavior.
+
−#
+
−#  * 0: never
+
−#  * 1: always
+
−#  * 2: on content documents
+
−- name: accessibility.mouse_focuses_formcontrol
+
−  type: int32_t
+
−#ifdef XP_MACOSX
+
−  value: 2
+
−#else
+
−  value: 1
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to avoid accessibility activation on Windows shortly after clipboard
+
−# copy.
+
−#
+
−# Possible values are:
+
−#  * 0: never
+
−#  * 1: always
+
−#  * 2 (or others): when needed
+
−- name: accessibility.windows.suppress-after-clipboard-copy
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "alerts."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether to use platform-specific backends for showing desktop notifications.
+
−# If no such backend is available, or if the pref is false, then XUL
+
−# notifications are used.
+
−- name: alerts.useSystemBackend
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#if defined(XP_WIN)
+
− # On Windows, a COM Surrogate notification server receives notification events
+
− # and can relaunch the application after it has been closed.
+
−- name: alerts.useSystemBackend.windows.notificationserver.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: never
+
−#endif
+
−
+
−#ifdef ANDROID
+
−  #---------------------------------------------------------------------------
+
−  # Prefs starting with "android."
+
−  #---------------------------------------------------------------------------
+
−
+
−  # On Android, we want an opaque background to be visible under the page,
+
−  # so layout should not force a default background.
+
−-   name: android.widget_paints_background
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: android.touch_resampling.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "apz."
+
−# The apz prefs are explained in AsyncPanZoomController.cpp
+
−#---------------------------------------------------------------------------
+
−
+
−# amount we zoom in for a double tap gesture if we couldn't find any content
+
−# based rect to zoom to
+
−- name: apz.doubletapzoom.defaultzoomin
+
−  type: AtomicFloat
+
−  value: 1.2f
+
−  mirror: always
+
−
+
−- name: apz.scrollbarbuttonrepeat.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.scrollend-event.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# After a user has executed a pan gesture, we may receive momentum phase pan
+
−# gestures from the OS. This specifies how long we should wait following the
+
−# pan end gesture for possible momentum phase pan gestures before sending the
+
−# TransformEnd notification.
+
−- name: apz.scrollend-event.content.delay_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: apz.wr.activate_all_scroll_frames
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.wr.activate_all_scroll_frames_when_fission
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.prefer_jank_minimal_displayports
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.allow_double_tap_zooming
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.mac.enable_double_tap_zoom_touchpad_gesture
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.allow_immediate_handoff
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.allow_zooming
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.max_zoom
+
−  type: AtomicFloat
+
−  value: 10.0f
+
−  mirror: always
+
−
+
−- name: apz.min_zoom
+
−  type: AtomicFloat
+
−  value: 0.25f
+
−  mirror: always
+
−
+
−- name: apz.allow_zooming_out
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.android.chrome_fling_physics.friction
+
−  type: AtomicFloat
+
−  value: 0.015f
+
−  mirror: always
+
−
+
−- name: apz.android.chrome_fling_physics.inflexion
+
−  type: AtomicFloat
+
−  value: 0.35f
+
−  mirror: always
+
−
+
−- name: apz.android.chrome_fling_physics.stop_threshold
+
−  type: AtomicFloat
+
−  value: 0.1f
+
−  mirror: always
+
−
+
−- name: apz.autoscroll.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.axis_lock.breakout_angle
+
−  type: AtomicFloat
+
−  value: float(M_PI / 8.0)    # 22.5 degrees
+
−  mirror: always
+
−  include: <cmath>
+
−
+
−- name: apz.axis_lock.breakout_threshold
+
−  type: AtomicFloat
+
−  value: 1.0f / 32.0f
+
−  mirror: always
+
−
+
−- name: apz.axis_lock.direct_pan_angle
+
−  type: AtomicFloat
+
−  value: float(M_PI / 3.0)    # 60 degrees
+
−  mirror: always
+
−  include: <cmath>
+
−
+
−- name: apz.axis_lock.lock_angle
+
−  type: AtomicFloat
+
−  value: float(M_PI / 6.0)    # 30 degrees
+
−  mirror: always
+
−  include: <cmath>
+
−
+
−# Whether to lock touch scrolling to one axis at a time. When a new
+
−# axis lock mode is added, the APZCAxisLockCompatTester GTest shoud
+
−# be updated to include the lock mode value.
+
−# 0 = FREE (No locking at all)
+
−# 1 = STANDARD (Once locked, remain locked until scrolling ends)
+
−# 2 = STICKY (Allow lock to be broken, with hysteresis)
+
−# 3 = DOMINANT_AXIS (Only allow movement on one axis at a time, only
+
−#     applies to touchpad scrolling)
+
−- name: apz.axis_lock.mode
+
−  type: RelaxedAtomicInt32
+
−#if defined(XP_MACOSX)
+
−  value: 3
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−- name: apz.content_response_timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 400
+
−  mirror: always
+
−
+
−- name: apz.danger_zone_x
+
−  type: RelaxedAtomicInt32
+
−  value: 50
+
−  mirror: always
+
−
+
−- name: apz.danger_zone_y
+
−  type: RelaxedAtomicInt32
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: apz.disable_for_scroll_linked_effects
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.displayport_expiry_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 15000
+
−  mirror: always
+
−
+
−- name: apz.drag.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.drag.initial.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.drag.touch.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.enlarge_displayport_when_clipped
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Test only.
+
−- name: apz.fixed-margin-override.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Test only.
+
−- name: apz.fixed-margin-override.bottom
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Test only.
+
−- name: apz.fixed-margin-override.top
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: apz.fling_accel_base_mult
+
−  type: AtomicFloat
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−- name: apz.fling_accel_supplemental_mult
+
−  type: AtomicFloat
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−- name: apz.fling_accel_min_fling_velocity
+
−  type: AtomicFloat
+
−  value: 1.5f
+
−  mirror: always
+
−
+
−- name: apz.fling_accel_min_pan_velocity
+
−  type: AtomicFloat
+
−  value: 0.8f
+
−  mirror: always
+
−
+
−- name: apz.fling_accel_max_pause_interval_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 50
+
−  mirror: always
+
−
+
−- name: apz.fling_curve_function_x1
+
−  type: float
+
−  value: 0.0f
+
−  mirror: once
+
−
+
−- name: apz.fling_curve_function_x2
+
−  type: float
+
−  value: 1.0f
+
−  mirror: once
+
−
+
−- name: apz.fling_curve_function_y1
+
−  type: float
+
−  value: 0.0f
+
−  mirror: once
+
−
+
−- name: apz.fling_curve_function_y2
+
−  type: float
+
−  value: 1.0f
+
−  mirror: once
+
−
+
−- name: apz.fling_curve_threshold_inches_per_ms
+
−  type: AtomicFloat
+
−  value: -1.0f
+
−  mirror: always
+
−
+
−- name: apz.fling_friction
+
−  type: AtomicFloat
+
−  value: 0.002f
+
−  mirror: always
+
−
+
−- name: apz.fling_min_velocity_threshold
+
−  type: AtomicFloat
+
−  value: 0.5f
+
−  mirror: always
+
−
+
−- name: apz.fling_stop_on_tap_threshold
+
−  type: AtomicFloat
+
−  value: 0.05f
+
−  mirror: always
+
−
+
−- name: apz.fling_stopped_threshold
+
−  type: AtomicFloat
+
−  value: 0.01f
+
−  mirror: always
+
−
+
−- name: apz.touch_acceleration_factor_x
+
−  type: float
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−- name: apz.touch_acceleration_factor_y
+
−  type: float
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−# new scrollbar code for desktop zooming
+
−- name: apz.force_disable_desktop_zooming_scrollbars
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−-   name: apz.gtk.kinetic_scroll.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: apz.gtk.pangesture.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−# Mode to use when receiving pan gesture input.
+
−#
+
−#  * 0: Auto mode (uses the default behavior, subject to change).
+
−#  * 1: Page mode: Uses gtk deltas as a percentage of the page size to scroll. This mode matches:
+
−#
+
−#    https://gitlab.gnome.org/GNOME/gtk/blob/c734c7e9188b56f56c3a504abee05fa40c5475ac/gtk/gtkrange.c#L3063-3074
+
−#
+
−#  * 2: Pixel mode: Uses gtk deltas as a fixed pixel multiplier. This mode matches e.g. GNOME web.
+
−#
+
−#    https://webkit-search.igalia.com/webkit/rev/215039ef09d6bfd6e088175bfe30788d95b9705d/Source/WebKit/Shared/gtk/WebEventFactory.cpp#265-296
+
−#    (multiplied then by pixelsPerLineStep which in GNOME-web is 40).
+
−-   name: apz.gtk.pangesture.delta_mode
+
−    type: uint32_t
+
−#ifdef NIGHTLY_BUILD
+
−    value: 2
+
−#else
+
−    value: 0
+
−#endif
+
−    mirror: always
+
−
+
−-   name: apz.gtk.pangesture.page_delta_mode_multiplier
+
−    type: float
+
−    value: 1.0f
+
−    mirror: always
+
−
+
−-   name: apz.gtk.pangesture.pixel_delta_mode_multiplier
+
−    type: float
+
−    value: 40.0f
+
−    mirror: always
+
−
+
−-   name: apz.gtk.touchpad_pinch.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: apz.gtk.touchpad_pinch.three_fingers.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−- name: apz.keyboard.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: once
+
−
+
−- name: apz.keyboard.passive-listeners
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−- name: apz.max_tap_time
+
−  type: RelaxedAtomicInt32
+
−  value: 300
+
−  mirror: always
+
−
+
−- name: apz.max_velocity_inches_per_ms
+
−  type: AtomicFloat
+
−  value: -1.0f
+
−  mirror: always
+
−
+
−- name: apz.max_velocity_queue_size
+
−  type: uint32_t
+
−  value: 5
+
−  mirror: once
+
−
+
−- name: apz.min_skate_speed
+
−  type: AtomicFloat
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−- name: apz.mvm.force-enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.one_touch_pinch.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−- name: apz.overscroll.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_MACOSX) || defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# The "test async scroll offset" (used via reftest-async-scroll
+
−# or nsIDOMWindowUtils.setAsyncScrollOffset()) can be used to
+
−# trigger overscroll. Used for tests only.
+
−- name: apz.overscroll.test_async_scroll_offset.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.overscroll.min_pan_distance_ratio
+
−  type: AtomicFloat
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−- name: apz.overscroll.stop_distance_threshold
+
−  type: AtomicFloat
+
−  value: 5.0f
+
−  mirror: always
+
−
+
−- name: apz.overscroll.spring_stiffness
+
−  type: AtomicFloat
+
−  value: 200
+
−  mirror: always
+
−
+
−- name: apz.overscroll.damping
+
−  type: AtomicFloat
+
−  value: 1.1
+
−  mirror: always
+
−
+
−- name: apz.overscroll.max_velocity
+
−  type: AtomicFloat
+
−  value: 10
+
−  mirror: always
+
−
+
−- name: apz.paint_skipping.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Fetch displayport updates early from the message queue.
+
−- name: apz.pinch_lock.mode
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−
+
−- name: apz.pinch_lock.scroll_lock_threshold
+
−  type: AtomicFloat
+
−  value: 1.0f / 16.0f   # 1/16 inches
+
−  mirror: always
+
−
+
−- name: apz.pinch_lock.span_breakout_threshold
+
−  type: AtomicFloat
+
−  value: 1.0f / 32.0f   # 1/32 inches
+
−  mirror: always
+
−
+
−- name: apz.pinch_lock.span_lock_threshold
+
−  type: AtomicFloat
+
−  value: 1.0f / 32.0f   # 1/32 inches
+
−  mirror: always
+
−
+
−- name: apz.pinch_lock.buffer_max_age
+
−  type: int32_t
+
−  value: 80   # milliseconds
+
−  mirror: once
+
−
+
−- name: apz.popups.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to print the APZC tree for debugging.
+
−- name: apz.printtree
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.record_checkerboarding
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−- name: apz.second_tap_tolerance
+
−  type: AtomicFloat
+
−  value: 0.5f
+
−  mirror: always
+
−
+
−# If this is true, APZ fully recalculates the scroll thumb size and
+
−# position in the compositor. This leads to the size and position
+
−# being more accurate in scenarios such as async zooming.
+
−- name: apz.scrollthumb.recalc
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.test.fails_with_native_injection
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.test.logging_enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.touch_move_tolerance
+
−  type: AtomicFloat
+
−  value: 0.1f
+
−  mirror: always
+
−
+
−- name: apz.touch_start_tolerance
+
−  type: AtomicFloat
+
−  value: 0.1f
+
−  mirror: always
+
−
+
−- name: apz.velocity_bias
+
−  type: AtomicFloat
+
−  value: 0.0f
+
−  mirror: always
+
−
+
−- name: apz.velocity_relevance_time_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: apz.windows.force_disable_direct_manipulation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: apz.windows.use_direct_manipulation
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.windows.check_for_pan_gesture_conversion
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: apz.x_skate_highmem_adjust
+
−  type: AtomicFloat
+
−  value: 0.0f
+
−  mirror: always
+
−
+
−- name: apz.x_skate_size_multiplier
+
−  type: AtomicFloat
+
−  value: 1.25f
+
−  mirror: always
+
−
+
−- name: apz.x_stationary_size_multiplier
+
−  type: AtomicFloat
+
−  value: 1.5f
+
−  mirror: always
+
−
+
−- name: apz.y_skate_highmem_adjust
+
−  type: AtomicFloat
+
−  value: 0.0f
+
−  mirror: always
+
−
+
−- name: apz.y_skate_size_multiplier
+
−  type: AtomicFloat
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: 1.5f
+
−#else
+
−  value: 3.5f
+
−#endif
+
−  mirror: always
+
−
+
−- name: apz.y_stationary_size_multiplier
+
−  type: AtomicFloat
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: 1.5f
+
−#else
+
−  value: 3.5f
+
−#endif
+
−  mirror: always
+
−
+
−- name: apz.zoom_animation_duration_ms
+
−  type: RelaxedAtomicInt32
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: 250
+
−#else
+
−  value: 350
+
−#endif
+
−  mirror: always
+
−
+
−- name: apz.scale_repaint_delay_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 500
+
−  mirror: always
+
−
+
−# Whether to use rounded external scroll offsets.
+
−- name: apz.rounded_external_scroll_offset
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "beacon."
+
−#---------------------------------------------------------------------------
+
−
+
−# Is support for Navigator.sendBeacon enabled?
+
−- name: beacon.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "bidi."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether delete and backspace should immediately delete characters not
+
−# visually adjacent to the caret, or adjust the visual position of the caret
+
−# on the first keypress and delete the character on a second keypress
+
−- name: bidi.edit.delete_immediately
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Bidi caret movement style:
+
−# 0 = logical
+
−# 1 = visual
+
−# 2 = visual, but logical during selection
+
−- name: bidi.edit.caret_movement_style
+
−  type: int32_t
+
−#if !defined(XP_LINUX) && defined(NIGHTLY_BUILD)
+
−  value: 1
+
−#else
+
−  value: 2 # See Bug 1638240
+
−#endif
+
−  mirror: always
+
−
+
−# Bidi numeral style:
+
−# 0 = nominalnumeralBidi *
+
−# 1 = regularcontextnumeralBidi
+
−# 2 = hindicontextnumeralBidi
+
−# 3 = arabicnumeralBidi
+
−# 4 = hindinumeralBidi
+
−# 5 = persiancontextnumeralBidi
+
−# 6 = persiannumeralBidi
+
−- name: bidi.numeral
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Bidi text type
+
−# 1 = charsettexttypeBidi *
+
−# 2 = logicaltexttypeBidi
+
−# 3 = visualtexttypeBidi
+
−- name: bidi.texttype
+
−  type: RelaxedAtomicUint32
+
−  value: 1
+
−  mirror: always
+
−
+
−# Bidi direction
+
−# 1 = directionLTRBidi *
+
−# 2 = directionRTLBidi
+
−- name: bidi.direction
+
−  type: RelaxedAtomicUint32
+
−  value: 1
+
−  mirror: always
+
−
+
−# Setting this pref to |true| forces Bidi UI menu items and keyboard shortcuts
+
−# to be exposed, and enables the directional caret hook. By default, only
+
−# expose it for bidi-associated system locales.
+
−- name: bidi.browser.ui
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "browser."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: browser.active_color
+
−  type: String
+
−  value: "#EE0000"
+
−  mirror: never
+
−
+
−- name: browser.active_color.dark
+
−  type: String
+
−  value: "#FF6666"
+
−  mirror: never
+
−
+
−- name: browser.anchor_color
+
−  type: String
+
−  value: "#0000EE"
+
−  mirror: never
+
−
+
−# If you change this, you probably also want to change
+
−# nsXPLookAndFeel::GenericDarkColor for MozNativehyperlinktext.
+
−- name: browser.anchor_color.dark
+
−  type: String
+
−  value: "#8C8CFF"
+
−  mirror: never
+
−
+
−# See http://dev.w3.org/html5/spec/forms.html#attr-fe-autofocus
+
−- name: browser.autofocus
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: browser.cache.disk.enable
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: browser.cache.memory.enable
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Limit of recent metadata we keep in memory for faster access, in KB.
+
−- name: browser.cache.disk.metadata_memory_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 250   # 0.25 MB
+
−  mirror: always
+
−
+
−# Does the user want smart-sizing?
+
−- name: browser.cache.disk.smart_size.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disk cache capacity in kilobytes. It's used only when
+
−# browser.cache.disk.smart_size.enabled == false
+
−- name: browser.cache.disk.capacity
+
−  type: RelaxedAtomicUint32
+
−  value: 256000
+
−  mirror: always
+
−
+
−# -1 = determine dynamically, 0 = none, n = memory capacity in kilobytes.
+
−- name: browser.cache.memory.capacity
+
−  type: RelaxedAtomicInt32
+
−  value: -1
+
−  mirror: always
+
−
+
−# When smartsizing is disabled we could potentially fill all disk space by
+
−# cache data when the disk capacity is not set correctly. To avoid that we
+
−# check the free space every time we write some data to the cache. The free
+
−# space is checked against two limits. Once the soft limit is reached we start
+
−# evicting the least useful entries, when we reach the hard limit writing to
+
−# the entry fails.
+
−- name: browser.cache.disk.free_space_soft_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 5 * 1024   # 5MB
+
−  mirror: always
+
−
+
−- name: browser.cache.disk.free_space_hard_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 1024    # 1MB
+
−  mirror: always
+
−
+
−# The number of chunks we preload ahead of read. One chunk currently has
+
−# 256kB.
+
−- name: browser.cache.disk.preload_chunk_count
+
−  type: RelaxedAtomicUint32
+
−  value: 4    # 1 MB of read ahead
+
−  mirror: always
+
−
+
−# Max-size (in KB) for entries in disk cache. Set to -1 for no limit.
+
−# (Note: entries bigger than 1/8 of disk-cache are never cached)
+
−- name: browser.cache.disk.max_entry_size
+
−  type: RelaxedAtomicUint32
+
−  value: 50 * 1024    # 50 MB
+
−  mirror: always
+
−
+
−# Max-size (in KB) for entries in memory cache. Set to -1 for no limit.
+
−# (Note: entries bigger than than 90% of the mem-cache are never cached.)
+
−- name: browser.cache.memory.max_entry_size
+
−  type: RelaxedAtomicInt32
+
−  value: 5 * 1024
+
−  mirror: always
+
−
+
−# Memory limit (in kB) for new cache data not yet written to disk. Writes to
+
−# the cache are buffered and written to disk on background with low priority.
+
−# With a slow persistent storage these buffers may grow when data is coming
+
−# fast from the network. When the amount of unwritten data is exceeded, new
+
−# writes will simply fail. We have two buckets, one for important data
+
−# (priority) like html, css, fonts and js, and one for other data like images,
+
−# video, etc.
+
−# Note: 0 means no limit.
+
−- name: browser.cache.disk.max_chunks_memory_usage
+
−  type: RelaxedAtomicUint32
+
−  value: 40 * 1024
+
−  mirror: always
+
−- name: browser.cache.disk.max_priority_chunks_memory_usage
+
−  type: RelaxedAtomicUint32
+
−  value: 40 * 1024
+
−  mirror: always
+
−
+
−
+
−# Number of seconds the cache spends writing pending data and closing files
+
−# after shutdown has been signalled. Past that time data is not written and
+
−# files are left open for the OS to clean up.
+
−- name: browser.cache.max_shutdown_io_lag
+
−  type: RelaxedAtomicUint32
+
−  value: 2
+
−  mirror: always
+
−
+
−# After the max_shutdown_io_lag has passed, we will attempt to cancel
+
−# blocking IO (on windows). The CacheIOThread may pick up more blocking
+
−# tasks so we want to cancel those too. The main thread will be woken
+
−# up every shutdown_io_time_between_cancellations_ms to cancel the IO
+
−# on the other thread.
+
−- name: browser.cache.shutdown_io_time_between_cancellations_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 5
+
−  mirror: always
+
−
+
−# A percentage limit for media content type in the disk cache. When some entries
+
−# need to be evicted and media is over the limit, it's evicted first.
+
−- name: browser.cache.disk.content_type_media_limit
+
−  type: RelaxedAtomicInt32
+
−  value: 50
+
−  mirror: always
+
−
+
−# How often to validate document in cache
+
−#   0 = once-per-session,
+
−#   1 = each-time,
+
−#   2 = never,
+
−#   3 = when-appropriate/automatically
+
−- name: browser.cache.check_doc_frequency
+
−  type: RelaxedAtomicUint32
+
−  value: 3
+
−  mirror: always
+
−
+
−# Compression level for cached JavaScript bytecode
+
−#   0 = do not compress,
+
−#   1 = minimal compression,
+
−#   9 = maximal compression
+
−- name: browser.cache.jsbc_compression_level
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Whether tooltips are enabled.
+
−- name: browser.chrome.toolbar_tips
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether tooltips are hidden on keydown.
+
−#  0: never
+
−#  1: always
+
−#  2: only on non-modifier keys
+
−- name: browser.chrome.toolbar_tips.hide_on_keydown
+
−  type: uint32_t
+
−#if defined(XP_WIN)
+
−  value: 0
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−- name: browser.contentblocking.database.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# How many recent block/unblock actions per origins we remember in the
+
−# Content Blocking log for each top-level window.
+
−- name: browser.contentblocking.originlog.length
+
−  type: uint32_t
+
−  value: 32
+
−  mirror: always
+
−
+
−# Min font device pixel size at which to turn on high quality.
+
−- name: browser.display.auto_quality_min_font_size
+
−  type: RelaxedAtomicUint32
+
−  value: 20
+
−  mirror: always
+
−
+
−- name: browser.display.background_color
+
−  type: String
+
−  value: "#FFFFFF"
+
−  mirror: never
+
−
+
−- name: browser.display.background_color.dark
+
−  type: String
+
−  value: "#1C1B22"
+
−  mirror: never
+
−
+
−# This preference is a bit confusing because we use the opposite
+
−# string value in the colors dialog to indicate to users how FF HCM
+
−# will behave.
+
−# With resect to document colors, these values mean:
+
−# 0 = "default" = always, except in high contrast mode
+
−# 1 = "always"
+
−# 2 = "never"
+
−#
+
−# On windows, we set this to 0, which means FF HCM will mirror OS HCM.
+
−# Everywhere else, we set this to 1, disabling FF HCM.
+
−- name: browser.display.document_color_use
+
−  type: RelaxedAtomicUint32
+
−#if defined(XP_WIN)
+
−  value: 0
+
−#else
+
−  value: 1
+
−#endif
+
−  mirror: always
+
−  rust: true
+
−
+
−# 0 = always native
+
−# 1 = never native
+
−# other = default
+
−- name: browser.display.windows.non_native_menus
+
−  type: RelaxedAtomicUint32
+
−  value: 2
+
−  mirror: always
+
−  rust: true
+
−
+
−# This pref dictates whether or not backplates and background images
+
−# are to be drawn, when in high-contrast mode:
+
−#   false: do not draw backplates or render background images
+
−#   true: render background images and draw backplates
+
−# This condition is only considered when high-contrast mode is enabled
+
−# in Firefox, ie. when the user has:
+
−#   (1) mUseAccessibilityMode set to true (Widows high-contrast mode is on)
+
−#       AND browser.display.document_color_use set to 0
+
−#       (only with high-contrast themes) OR
+
−#   (2) browser.display.document_color_use set to 2 (always)
+
−- name: browser.display.permit_backplate
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether we should suppress the background-image of the canvas (the root
+
−# frame) if we're in forced colors mode.
+
−#
+
−# This is important because some sites use background-image with a plain color
+
−# and it causes undesirable results in high-contrast mode.
+
−#
+
−# See bug 1614921 for example.
+
−- name: browser.display.suppress_canvas_background_image_on_forced_colors
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: browser.display.focus_ring_on_anything
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.display.focus_ring_width
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: browser.display.focus_background_color
+
−  type: String
+
−  value: "#117722"
+
−  mirror: never
+
−
+
−# Focus ring border style.
+
−# 0 = solid border, 1 = dotted border
+
−- name: browser.display.focus_ring_style
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: browser.display.focus_text_color
+
−  type: String
+
−  value: "#ffffff"
+
−  mirror: never
+
−
+
−- name: browser.display.foreground_color
+
−  type: String
+
−  value: "#000000"
+
−  mirror: never
+
−
+
−- name: browser.display.foreground_color.dark
+
−  type: String
+
−  value: "#FBFBFE"
+
−  mirror: never
+
−
+
−# Determines the behavior of OS zoom settings.
+
−#
+
−#   0: doesn't affect rendering at all
+
−#   1: affects full zoom (dpi, effectively).
+
−#   2: affects text zoom.
+
−#
+
−# Default is (1): Historical behavior on Linux, matches other browsers on
+
−# Windows, and generally creates more consistent rendering.
+
−- name: browser.display.os-zoom-behavior
+
−  type: RelaxedAtomicInt32
+
−  value: 1
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether focus rings are always shown by default.
+
−#
+
−# This is the initial value of nsWindowRoot::mShowFocusRings, but it can be
+
−# overridden by system preferences.
+
−- name: browser.display.show_focus_rings
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable showing image placeholders while image is loading or when image is broken.
+
−- name: browser.display.show_image_placeholders
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we should always enable focus rings after focus was moved by keyboard.
+
−#
+
−# This behavior matches both historical and GTK / Windows focus behavior.
+
−#
+
−# :focus-visible is intended to provide better heuristics than this.
+
−- name: browser.display.always_show_rings_after_key_focus
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# In theory: 0 = never, 1 = quick, 2 = always, though we always just use it as
+
−# a bool!
+
−- name: browser.display.use_document_fonts
+
−  type: RelaxedAtomicInt32
+
−  value: 1
+
−  mirror: always
+
−  rust: true
+
−
+
−# font-family names for which we'll override use_document_fonts=0, and always
+
−# use the specified font.
+
−# This is to support ligature-icon fonts, which render literal strings like
+
−# "arrow_drop_down" with an icon, even when use_document_fonts is disabled.
+
−# If an author provides & uses such a font, and we decline to use it, we'll end
+
−# up rendering these literal strings where the author intended an icon, which
+
−# can cause all sorts of overlapping/unreadable content.
+
−- name: browser.display.use_document_fonts.icon_font_allowlist
+
−  type: String
+
−  value: >-
+
−    Material Icons,
+
−    Material Icons Extended,
+
−    Material Icons Outlined,
+
−    Material Icons Round,
+
−    Material Icons Sharp,
+
−    Material Icons Two Tone,
+
−    Google Material Icons,
+
−    Material Symbols Outlined,
+
−    Material Symbols Round,
+
−    Material Symbols Rounded,
+
−    Material Symbols Sharp
+
−  mirror: never
+
−
+
−- name: browser.display.use_focus_colors
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.display.use_system_colors
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_WIN
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: browser.dom.window.dump.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_MOZILLA_OFFICIAL@
+
−  mirror: always
+
−
+
−# See bug 1738574
+
−- name: browser.download.start_downloads_in_tmp_dir
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# See bug 1747343
+
−- name: browser.download.always_ask_before_handling_new_types
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# See bug 1731668
+
−- name: browser.download.enable_spam_prevention
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# See bug 1772569
+
−- name: browser.download.open_pdf_attachments_inline
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.download.sanitize_non_media_extensions
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Image document's automatic image sizing.
+
−- name: browser.enable_automatic_image_resizing
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Image document's click-to-resize.
+
−- name: browser.enable_click_image_resizing
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−- name: browser.find.ignore_ruby_annotations
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#if defined(XP_MACOSX)
+
−# Whether pressing Esc will exit fullscreen.
+
−- name: browser.fullscreen.exit_on_escape
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# The max url length we'll store in history.
+
−#
+
−# The default value is mostly a guess based on various facts:
+
−#
+
−# * IE didn't support urls longer than 2083 chars
+
−# * Sitemaps protocol used to support a maximum of 2048 chars
+
−# * Various SEO guides suggest to not go over 2000 chars
+
−# * Various apps/services are known to have issues over 2000 chars
+
−# * RFC 2616 - HTTP/1.1 suggests being cautious about depending
+
−#   on URI lengths above 255 bytes
+
−#
+
−- name: browser.history.maxUrlLength
+
−  type: uint32_t
+
−  value: 2000
+
−  mirror: always
+
−
+
−# Max size of push/replaceState data parameter
+
−- name: browser.history.maxStateObjectSize
+
−  type: int32_t
+
−  value: 16777216
+
−  mirror: always
+
−
+
−# True to collect wireframes upon navigations / pushState
+
−- name: browser.history.collectWireframes
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# The minimum area for a rect to be included in a wireframe, in CSS pixels.
+
−#
+
−# The current value of 50 is pretty arbitrary, and will be tuned as we refine
+
−# and test the wireframing capability.
+
−- name: browser.history.wireframeAreaThreshold
+
−  type: uint32_t
+
−  value: 50
+
−  mirror: always
+
−
+
−#if defined(XP_WIN) || defined(XP_LINUX)
+
−  # Notify TabUnloader or send the memory pressure if the memory resource
+
−  # notification is signaled AND the available commit space is lower than
+
−  # this value.
+
−-   name: browser.low_commit_space_threshold_mb
+
−    type: RelaxedAtomicUint32
+
−    value: 200
+
−    mirror: always
+
−#endif
+
−
+
−#ifdef XP_LINUX
+
−  # On Linux we also check available memory in comparison to total memory,
+
−  # and use this percent value (out of 100) to determine if we are in a
+
−  # low memory scenario.
+
−-   name: browser.low_commit_space_threshold_percent
+
−    type: RelaxedAtomicUint32
+
−    value: 5
+
−    mirror: always
+
−#endif
+
−
+
−# Render animations and videos as a solid color
+
−- name: browser.measurement.render_anims_and_video_solid
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.navigation.requireUserInteraction
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Indicates if about:newtab shows content (enabled) or just blank.
+
−- name: browser.newtabpage.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Open PDFs in Edge with the --app flag if it is the default.
+
−- name: browser.pdf.launchDefaultEdgeAsApp
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Maximium delay between keystrokes that will be considered typing (milliseconds).
+
−- name: browser.places.interactions.typing_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 3000
+
−  mirror: always
+
−
+
−# Maximum delay between scroll input events that will be considered a scrolling interaction (milliseconds).
+
−- name: browser.places.interactions.scrolling_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Number of seconds till the sponsored session is timeout.
+
−- name: browser.places.sponsoredSession.timeoutSecs
+
−  type: RelaxedAtomicUint32
+
−  value: 3600
+
−  mirror: always
+
−
+
−# Whether to start the private browsing mode at application startup
+
−- name: browser.privatebrowsing.autostart
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Force usage of in-memory (rather than file on disk) media cache for video streaming when private browsing
+
−- name: browser.privatebrowsing.forceMediaMemoryCache
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Communicates the toolbar color to platform (for e.g., prefers-color-scheme).
+
−#
+
−# Returns whether the toolbar is dark (0), light (1), or system (2).
+
−#
+
−# Default to "light" on macOS / Windows, and "system" elsewhere. The theming
+
−# code sets it appropriately.
+
−- name: browser.theme.toolbar-theme
+
−  type: RelaxedAtomicUint32
+
−#if defined(XP_WIN) || defined(XP_MACOSX)
+
−  value: 1
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−# Communicates the preferred content theme color to platform (for e.g.,
+
−# prefers-color-scheme).
+
−#
+
−# dark (0), light (1), system (2), or toolbar (3).
+
−#
+
−# Default to "toolbar", the theming code sets it appropriately.
+
−- name: browser.theme.content-theme
+
−  type: RelaxedAtomicUint32
+
−  value: 2
+
−  mirror: always
+
−  rust: true
+
−
+
−# Blocked plugin content
+
−- name: browser.safebrowsing.blockedURIs.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Malware protection
+
−- name: browser.safebrowsing.malware.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Password protection
+
−- name: browser.safebrowsing.passwords.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Phishing protection
+
−- name: browser.safebrowsing.phishing.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Maximum size for an array to store the safebrowsing prefixset.
+
−- name: browser.safebrowsing.prefixset_max_array_size
+
−  type: RelaxedAtomicUint32
+
−  value: 512*1024
+
−  mirror: always
+
−
+
−# SessionStore prefs
+
−# Maximum number of bytes of DOMSessionStorage data we collect per origin.
+
−- name: browser.sessionstore.dom_storage_limit
+
−  type: uint32_t
+
−  value: 2048
+
−  mirror: always
+
−
+
−# Maximum number of characters of form field data per field we collect.
+
−- name: browser.sessionstore.dom_form_limit
+
−  type: uint32_t
+
−  value: 1024*1024*2
+
−  mirror: always
+
−
+
−# Maximum number of characters of form data we collect per origin.
+
−- name: browser.sessionstore.dom_form_max_limit
+
−  type: uint32_t
+
−  value: 1024*1024*50
+
−  mirror: always
+
−
+
−# Minimal interval between two save operations in milliseconds (while the user is active).
+
−- name: browser.sessionstore.interval
+
−  type: RelaxedAtomicUint32
+
−  value: 15000
+
−  mirror: always
+
−
+
−# Platform collection of data for session store
+
−- name: browser.sessionstore.platform_collection
+
−  type: bool
+
−#if defined(ANDROID) || defined(MOZ_THUNDERBIRD)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: once
+
−
+
−# Platform collection of session storage data for session store
+
−- name: browser.sessionstore.collect_session_storage
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: once
+
−
+
−# Platform collection of zoom data for session store
+
−- name: browser.sessionstore.collect_zoom
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: once
+
−
+
−# Causes SessionStore to ignore non-final update messages from
+
−# browser tabs that were not caused by a flush from the parent.
+
−# This is a testing flag and should not be used by end-users.
+
−- name: browser.sessionstore.debug.no_auto_updates
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we should draw the tabs on top of the titlebar.
+
−#
+
−# no (0), yes (1), or default (2), which is true everywhere except Linux.
+
−- name: browser.tabs.inTitlebar
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# If set, use DocumentChannel to directly initiate loads entirely
+
−# from parent-process BrowsingContexts
+
−- name: browser.tabs.documentchannel.parent-controlled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Testing-only pref which makes data: URIs be loaded in a "web" content process
+
−# instead of within a process based on the URI's loader.
+
−- name: browser.tabs.remote.dataUriInDefaultWebProcess
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Testing-only pref to force system-triggered about:blank loads to not change
+
−# content processes. This is used for performance tests which load an
+
−# about:blank document between navigations for historical reasons to avoid
+
−# unnecessary process switches.
+
−- name: browser.tabs.remote.systemTriggeredAboutBlankAnywhere
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Testing-only pref to cause PBrowser creation for a specific BrowsingContext to
+
−# fail, to test the errored codepath.
+
−- name: browser.tabs.remote.testOnly.failPBrowserCreation.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.tabs.remote.desktopbehavior
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.tabs.remote.force-paint
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is enabled document loads with a mismatched
+
−# Cross-Origin-Embedder-Policy header will fail to load
+
−- name: browser.tabs.remote.useCrossOriginEmbedderPolicy
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# This pref makes `credentialless` a valid value for
+
−# Cross-Origin-Embedder-Policy header
+
−- name: browser.tabs.remote.coep.credentialless
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# When this pref is enabled top level loads with a mismatched
+
−# Cross-Origin-Opener-Policy header will be loaded in a separate process.
+
−- name: browser.tabs.remote.useCrossOriginOpenerPolicy
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is enabled then we use a separate content process for
+
−# top-level load of file:// URIs
+
−- name: browser.tabs.remote.separateFileUriProcess
+
−  type: RelaxedAtomicBool
+
−#if !defined(ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Pref to control whether we use a separate privileged content process
+
−# for certain mozilla webpages (which are listed in the pref
+
−# browser.tabs.remote.separatedMozillaDomains).
+
−- name: browser.tabs.remote.separatePrivilegedMozillaWebContentProcess
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether or not process selection for subframes will prefer re-using an
+
−# existing content process over creating a new one. Enabling this pref should
+
−# reduce the number of processes allocated for non-first-party domains if
+
−# dom.ipc.processCount.webIsolated > 1.
+
−- name: browser.tabs.remote.subframesPreferUsed
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is enabled, opaque response is only allowed to enter the
+
−# content process if it's a response for media (audio, image, video), CSS, or
+
−# JavaScript.
+
−- name: browser.opaqueResponseBlocking
+
−  type: RelaxedAtomicBool
+
−#if defined(ANDROID)
+
−  value: false
+
−#else
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−#endif
+
−  mirror: always
+
−
+
−# When this pref is enabled, the JS validator will be enabled for
+
−# ORB.
+
−- name: browser.opaqueResponseBlocking.javascriptValidator
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# This pref controls how filtering of opaque responses for calls to `Window.fetch`.
+
−# (and similar) is performed in the parent process. This is intended to make sure
+
−# that data that would be filtered in a content process never actually reaches that
+
−# content process.
+
−# See https://fetch.spec.whatwg.org/#concept-filtered-response-opaque
+
−#   0) Don't filter in the parent process at all, and let content processes handle
+
−#      opaque filtering. Regardless of if ORB is enabled or not. N.B. that if ORB
+
−#      is enabled opaque responses will be blocked.
+
−#   1) If ORB is enabled, in the parent process, filter the responses that ORB allows.
+
−#      N.B. any responses ORB doesn't allow will not send data to a content process
+
−#      since they will return a NetworkError. If the request is allowed by ORB, the
+
−#      internal response will be intact and sent to the content process as is.
+
−#   2) If ORB is enabled, in the parent process, filter the responses that ORB blocks,
+
−#      when they were issued by `Window.fetch` (and similar).
+
−#   3) Filter all responses in the parent, regardless of if ORB is enabled or not.
+
−#      This means that opaque responses coming from `Window.fetch` won't even be
+
−#      considered for being blocked by ORB.
+
−- name: browser.opaqueResponseBlocking.filterFetchResponse
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# This pref controls how exceptions to opaque response blocking for the media MIME types
+
−# `audio/*` and `video/*` are handled. This is because step 8 in the spec that performs
+
−# audio or video type pattern matching cannot handle certain MIME types (yet).
+
−# See https://whatpr.org/fetch/1442.html#orb-algorithm
+
−#   0) No exceptions
+
−#   1) Some exceptions, explicitly hard coded in `IsOpaqueSafeListedSpecBreakingMIMEType`
+
−#   2) Allow all MIME types beginning with `audio/*` or `video/*`.
+
−- name: browser.opaqueResponseBlocking.mediaExceptionsStrategy
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# When this pref is enabled, <object> and <embed> elements will create
+
−# synthetic documents when the resource type they're loading is an image.
+
−- name: browser.opaqueResponseBlocking.syntheticBrowsingContext
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# When this pref is enabled, <object> and <embed> elements will filter the
+
−# browsing contexts created for the synthetic browsing contexts for the
+
−# synthetic documents when browser.opaqueResponseBlocking.syntheticBrowsingContext
+
−# is enabled from `Window.frames`, `Window.length` and named targeting.
+
−- name: browser.opaqueResponseBlocking.syntheticBrowsingContext.filter
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−# When true, zooming will be enabled on all sites, even ones that declare
+
−# user-scalable=no.
+
−- name: browser.ui.zoom.force-user-scalable
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: browser.underline_anchors
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: browser.viewport.desktopWidth
+
−  type: RelaxedAtomicInt32
+
−  value: 980
+
−  mirror: always
+
−
+
−- name: browser.visited_color
+
−  type: String
+
−  value: "#551A8B"
+
−  mirror: never
+
−
+
−# If you change this, you probably also want to change
+
−# nsXPLookAndFeel::GenericDarkColor for MozNativevisitedhyperlinktext.
+
−- name: browser.visited_color.dark
+
−  type: String
+
−  value: "#FFADFF"
+
−  mirror: never
+
−
+
−# When true, soft reloads (including location.reload())
+
−# will only froce validate the top level document, subresources will
+
−# be loaded normally as-if users normally navigated to the page.
+
−- name: browser.soft_reload.only_force_validate_top_level_document
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "canvas."
+
−#---------------------------------------------------------------------------
+
−
+
−# Add support for canvas path objects
+
−- name: canvas.path.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: canvas.capturestream.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CanvasRenderingContext2D.filter enabled?
+
−- name: canvas.filters.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Provide ability to turn on support for canvas focus rings.
+
−- name: canvas.focusring.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CanvasRenderingContext2D's createConicGradient API enabled?
+
−- name: canvas.createConicGradient.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "channelclassifier."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: channelclassifier.allowlist_example
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "clipboard."
+
−#---------------------------------------------------------------------------
+
−
+
−# Clipboard behavior.
+
−- name: clipboard.autocopy
+
−  type: bool
+
−#if !defined(ANDROID) && !defined(XP_MACOSX) && defined(XP_UNIX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−#ifdef XP_WIN
+
−  # allow to copy clipboard data to Clipboard History/Cloud
+
−  # (used on sensitive data in about:logins and Private Browsing)
+
−-   name: clipboard.copyPrivateDataToClipboardCloudOrHistory
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "consoleservice."
+
−#---------------------------------------------------------------------------
+
−
+
−#if defined(ANDROID)
+
−  # Disable sending console to logcat on release builds.
+
−-   name: consoleservice.logcat
+
−    type: RelaxedAtomicBool
+
−    value: @IS_NOT_RELEASE_OR_BETA@
+
−    mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "content."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: content.cors.disable
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Back off timer notification after count.
+
−# -1 means never.
+
−- name: content.notify.backoffcount
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# Notification interval in microseconds.
+
−# The notification interval has a dramatic effect on how long it takes to
+
−# initially display content for slow connections. The current value
+
−# provides good incremental display of content without causing an increase
+
−# in page load time. If this value is set below 1/10 of a second it starts
+
−# to impact page load performance.
+
−# See bugzilla bug 72138 for more info.
+
−- name: content.notify.interval
+
−  type: int32_t
+
−  value: 120000
+
−  mirror: always
+
−
+
−# Do we notify based on time?
+
−- name: content.notify.ontimer
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# How many times to deflect in interactive mode.
+
−- name: content.sink.interactive_deflect_count
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# How many times to deflect in perf mode.
+
−- name: content.sink.perf_deflect_count
+
−  type: int32_t
+
−  value: 200
+
−  mirror: always
+
−
+
−# Parse mode for handling pending events.
+
−# 0 = don't check for pending events
+
−# 1 = don't deflect if there are pending events
+
−# 2 = bail if there are pending events
+
−- name: content.sink.pending_event_mode
+
−  type: int32_t
+
−#ifdef XP_WIN
+
−  value: 1
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# How often to probe for pending events. 1 = every token.
+
−- name: content.sink.event_probe_rate
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# How long to stay off the event loop in interactive mode (microseconds).
+
−- name: content.sink.interactive_parse_time
+
−  type: int32_t
+
−  value: 3000
+
−  mirror: always
+
−
+
−# How long to stay off the event loop in perf mode.
+
−- name: content.sink.perf_parse_time
+
−  type: int32_t
+
−  value: 30000
+
−  mirror: always
+
−
+
−#  How long to be in interactive mode after an event.
+
−- name: content.sink.interactive_time
+
−  type: uint32_t
+
−  value: 750000
+
−  mirror: always
+
−
+
−# How long to stay in perf mode after initial loading.
+
−- name: content.sink.initial_perf_time
+
−  type: uint32_t
+
−  value: 2000000
+
−  mirror: always
+
−
+
−# Should we switch between perf-mode and interactive-mode?
+
−# 0 = Switch
+
−# 1 = Interactive mode
+
−# 2 = Perf mode
+
−- name: content.sink.enable_perf_mode
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "converter."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether we include ruby annotation in the text despite whether it
+
−# is requested. This was true because we didn't explicitly strip out
+
−# annotations. Set false by default to provide a better behavior, but
+
−# we want to be able to pref-off it if user doesn't like it.
+
−- name: converter.html2txt.always_include_ruby
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "cookiebanners."
+
−#---------------------------------------------------------------------------
+
−
+
−# Controls the cookie banner handling mode in normal browsing.
+
−# 0: Disables all cookie banner handling.
+
−# 1: Reject-all if possible, otherwise do nothing.
+
−# 2: Reject-all if possible, otherwise accept-all.
+
−- name: cookiebanners.service.mode
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# When set to true, cookie banners are detected and detection events are
+
−# dispatched, but they will not be handled. Requires the service to be enabled
+
−# for the desired mode via pref cookiebanners.service.mode*
+
−- name: cookiebanners.service.detectOnly
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Controls the cookie banner handling mode in private browsing. Same mode
+
−# options as the normal browsing pref above.
+
−- name: cookiebanners.service.mode.privateBrowsing
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# Enables use of global CookieBannerRules, which apply to all sites. This is
+
−# used for click rules that can handle common Consent Management Providers
+
−# (CMP).
+
−# Enabling this (when the cookie handling feature is enabled) may negatively
+
−# impact site performance since it requires us to run rule-defined query
+
−# selectors for every page.
+
−- name: cookiebanners.service.enableGlobalRules
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables the cookie banner cookie injector. The cookie banner cookie injector
+
−# depends on the `cookiebanners.service.mode` pref above.
+
−- name: cookiebanners.cookieInjector.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−
+
−# By default, how many seconds in the future cookies should expire after they
+
−# have been injected. Defaults to 12 months. Individual cookie rules may
+
−# override this.
+
−- name: cookiebanners.cookieInjector.defaultExpiryRelative
+
−  type: uint32_t
+
−  value: 31536000
+
−  mirror: always
+
−
+
−# Enables the cookie banner auto clicking. The cookie banner auto clicking
+
−# depends on the `cookiebanners.service.mode` pref above.
+
−- name: cookiebanners.bannerClicking.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum time in ms for detecting banner and button elements for cookie
+
−# banner auto clicking.
+
−- name: cookiebanners.bannerClicking.timeout
+
−  type: uint32_t
+
−  value: 3000
+
−  mirror: always
+
−
+
−# Whether or not banner auto clicking test mode is enabled.
+
−- name: cookiebanners.bannerClicking.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "datareporting."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: datareporting.healthreport.uploadEnabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "device."
+
−#---------------------------------------------------------------------------
+
−
+
−# Is support for the device sensors API enabled?
+
−- name: device.sensors.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# KaiOS-only, see https://bugzilla.mozilla.org/show_bug.cgi?id=1699707#c10
+
−- name: device.sensors.ambientLight.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: device.sensors.motion.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: device.sensors.orientation.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# KaiOS-only, see https://bugzilla.mozilla.org/show_bug.cgi?id=1699707#c10
+
−- name: device.sensors.proximity.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: device.sensors.test.events
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "devtools."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: devtools.console.stdout.chrome
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_MOZILLA_OFFICIAL@
+
−  mirror: always
+
−
+
−- name: devtools.console.stdout.content
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: devtools.toolbox.force-chrome-prefs
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "docshell."
+
−#---------------------------------------------------------------------------
+
−
+
−# Used to indicate whether session history listeners should be notified
+
−# about content viewer eviction. Used only for testing.
+
−- name: docshell.shistory.testing.bfevict
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, pages with an opener won't be bfcached.
+
−- name: docshell.shistory.bfcache.require_no_opener
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# If true, page with beforeunload or unload event listeners can be bfcached.
+
−- name: docshell.shistory.bfcache.allow_unload_listeners
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# If true, page with beforeunload event listeners can be bfcached.
+
−# This only works when sessionHistoryInParent is enabled.
+
−- name: docshell.shistory.bfcache.ship_allow_beforeunload_listeners
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "dom."
+
−#---------------------------------------------------------------------------
+
−
+
−# Allow cut/copy
+
−- name: dom.allow_cut_copy
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Checks if offscreen animation throttling is enabled.
+
−- name: dom.animations.offscreen-throttling
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for automatically removing replaced filling animations enabled?
+
−- name: dom.animations-api.autoremove.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for composite operations from the Web Animations API enabled?
+
−- name: dom.animations-api.compositing.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for the core interfaces of Web Animations API enabled?
+
−- name: dom.animations-api.core.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for Document.getAnimations() and Element.getAnimations()
+
−# supported?
+
−- name: dom.animations-api.getAnimations.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for animations from the Web Animations API without 0%/100%
+
−# keyframes enabled?
+
−- name: dom.animations-api.implicit-keyframes.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for timelines from the Web Animations API enabled?
+
−- name: dom.animations-api.timelines.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Synchronize transform animations with geometric animations on the
+
−# main thread.
+
−- name: dom.animations.mainthread-synchronization-with-geometric-animations
+
−  type: bool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Is support for Navigator.getBattery enabled?
+
−- name: dom.battery.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block multiple external protocol URLs in iframes per single event.
+
−- name: dom.block_external_protocol_in_iframes
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block sandboxed BrowsingContexts from navigating to external protocols.
+
−- name: dom.block_external_protocol_navigation_from_sandbox
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block Insecure downloads from Secure Origins
+
−- name: dom.block_download_insecure
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block multiple window.open() per single event.
+
−- name: dom.block_multiple_popups
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum number of popup that is allowed to be opened. Set to -1 for no
+
−# limit.
+
−- name: dom.popup_maximum
+
−  type: int32_t
+
−  value: 20
+
−  mirror: always
+
−
+
−# Whether window.location.reload() and window.history.go(0) should be blocked
+
−# when called directly from a window resize event handler.
+
−#
+
−# This used to be necessary long ago to prevent terrible UX when using stuff
+
−# like TypeAheadFind (bug 258917), but it also causes compat issues on mobile
+
−# (bug 1570566).
+
−- name: dom.block_reload_from_resize_event_handler
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Exposes window.caches and skips SecureContext check.
+
−# dom.serviceWorkers.testing.enabled also includes the same effect.
+
−- name: dom.caches.testing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Disable capture attribute for input elements; only supported on GeckoView.
+
−- name: dom.capture.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# HTML specification says the level should be 5
+
−# https://html.spec.whatwg.org/#timer-initialisation-steps
+
−- name: dom.clamp.timeout.nesting.level
+
−  type: uint32_t
+
−  value: 5
+
−  mirror: once
+
−
+
−# Disable custom highlight API; implementation pending.
+
−- name: dom.customHighlightAPI.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Allow control characters appear in composition string.
+
−# When this is false, control characters except
+
−# CHARACTER TABULATION (horizontal tab) are removed from
+
−# both composition string and data attribute of compositionupdate
+
−# and compositionend events.
+
−- name: dom.compositionevent.allow_control_characters
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Compression Streams (CompressionStream/DecompressionStream)
+
−- name: dom.compression_streams.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CSSPseudoElement enabled?
+
−- name: dom.css_pseudo_element.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# After how many seconds we allow external protocol URLs in iframe when not in
+
−# single events
+
−- name: dom.delay.block_external_protocol_in_iframes
+
−  type: uint32_t
+
−  value: 10   # in seconds
+
−  mirror: always
+
−
+
−# Whether the above pref has any effect at all.
+
−# Make sure cases like bug 1795380 work before trying to turn this off. See
+
−# bug 1680721 for some other context that might be relevant.
+
−- name: dom.delay.block_external_protocol_in_iframes.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Only propagate the open window click permission if the setTimeout() is equal
+
−# to or less than this value.
+
−- name: dom.disable_open_click_delay
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: dom.disable_open_during_load
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.disable_beforeunload
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.require_user_interaction_for_beforeunload
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable/disable Gecko specific edit commands
+
−- name: dom.document.edit_command.contentReadOnly.enabled
+
−  type: bool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−- name: dom.document.edit_command.insertBrOnReturn.enabled
+
−  type: bool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# If set this to true, `Document.execCommand` may be performed nestedly.
+
−# Otherwise, nested calls just return false.
+
−- name: dom.document.exec_command.nested_calls_allowed
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.enable_window_print
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Only intended for fuzzing purposes, this will break mozPrintCallback, etc.
+
−- name: dom.window_print.fuzzing.block_while_printing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.element.transform-getters.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the popover attribute implementation is enabled,
+
−# see https://html.spec.whatwg.org/#the-popover-attribute
+
−- name: dom.element.popover.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Controls whether the "focus fixup rule" is enabled. Subject to minor changes
+
−# based on https://github.com/whatwg/html/pull/8392 and
+
−# https://github.com/whatwg/html/issues/8225
+
−- name: dom.focus.fixup
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.mouse_capture.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for Performance.mozMemory enabled?
+
−- name: dom.enable_memory_stats
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable Performance API
+
−# Whether nonzero values can be returned from performance.timing.*
+
−- name: dom.enable_performance
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable Performance Observer API
+
−- name: dom.enable_performance_observer
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether resource timing will be gathered and returned by performance.GetEntries*
+
−- name: dom.enable_resource_timing
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether event timing will be gathered and returned by performance observer*
+
−- name: dom.enable_event_timing
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the LargestContentfulPaint API will be gathered and returned by performance observer*
+
−- name: dom.enable_largest_contentful_paint
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether performance.GetEntries* will contain an entry for the active document
+
−- name: dom.enable_performance_navigation_timing
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the scheduler interface will be exposed
+
−- name: dom.enable_web_task_scheduling
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# If this is true, it's allowed to fire "cut", "copy" and "paste" events.
+
−# Additionally, "input" events may expose clipboard content when inputType
+
−# is "insertFromPaste" or something.
+
−- name: dom.event.clipboardevents.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether Shift+Right click force-opens the context menu
+
−- name: dom.event.contextmenu.shift_suppresses_event
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether wheel listeners are passive by default.
+
−- name: dom.event.default_to_passive_wheel_listeners
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.event.dragexit.enabled
+
−  type: bool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether wheel event target's should be grouped. When enabled, all wheel
+
−# events that occur in a given wheel transaction have the same event target.
+
−- name: dom.event.wheel-event-groups.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether WheelEvent should return pixels instead of lines for
+
−# WheelEvent.deltaX/Y/Z, when deltaMode hasn't been checked.
+
−#
+
−# Other browsers don't use line deltas and websites forget to check for it, see
+
−# bug 1392460.
+
−- name: dom.event.wheel-deltaMode-lines.disabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Mostly for debugging. Whether we should do the same as
+
−# dom.event.wheel-deltaMode-lines.disabled, but unconditionally rather than
+
−# only when deltaMode hasn't been checked.
+
−- name: dom.event.wheel-deltaMode-lines.always-disabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# A blocklist (list of domains) for the
+
−# dom.event.wheel-deltaMode-lines.disabled behavior, in case potential
+
−# unforeseen problems with it arrive.
+
−- name: dom.event.wheel-deltaMode-lines.always-enabled
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−#if defined(XP_MACOSX)
+
−# Whether to disable treating ctrl click as right click
+
−- name: dom.event.treat_ctrl_click_as_right_click.disabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−#endif
+
−
+
−# Whether .offset{X,Y} for events targeted at SVG nodes returns bounds relative
+
−# to the outer SVG.
+
−- name: dom.events.offset-in-svg-relative-to-svg-root
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disable clipboard.read(), clipboard.write() and ClipboardItem by default
+
−- name: dom.events.asyncClipboard.clipboardItem
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Skips checking permission and user activation when accessing the clipboard.
+
−# Should only be enabled in tests.
+
−# Access with Clipboard::IsTestingPrefEnabled().
+
−- name: dom.events.testing.asyncClipboard
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Control whether `navigator.clipboard.readText()` is exposed to content.
+
−# Currently not supported by GeckoView, see bug 1776829.
+
−- name: dom.events.asyncClipboard.readText
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Guard for bug 1731504, in case fix breaks more websites
+
−# If true, event is first captured then bubbled on target element
+
−- name: dom.events.phases.correctOrderOnTarget
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# This pref controls whether or not the `protected` dataTransfer state is
+
−# enabled. If the `protected` dataTransfer stae is disabled, then the
+
−# DataTransfer will be read-only whenever it should be protected, and will not
+
−# be disconnected after a drag event is completed.
+
−- name: dom.events.dataTransfer.protected.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to hide normal files (i.e. non-images) in dataTransfer inside
+
−# the content process.
+
−- name: dom.events.dataTransfer.mozFile.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.events.dataTransfer.imageAsFile.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# User interaction timer interval, in ms
+
−- name: dom.events.user_interaction_interval
+
−  type: uint32_t
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Whether to try to compress touchmove events on IPC layer.
+
−- name: dom.events.compress.touchmove
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# In addition to the above IPC layer compresison, allow touchmove
+
−# events to be further coalesced in the child side after they
+
−# are sent.
+
−- name: dom.events.coalesce.touchmove
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Allow mousemove events to be coalesced in the child side after they are sent.
+
−- name: dom.events.coalesce.mousemove
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to expose test interfaces of various sorts
+
−- name: dom.expose_test_interfaces
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.fetchObserver.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allow the content process to create a File from a path. This is allowed just
+
−# on parent process, on 'file' Content process, or for testing.
+
−- name: dom.file.createInChild
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Support @autocomplete values for form autofill feature.
+
−- name: dom.forms.autocomplete.formautofill
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Only trusted submit event could trigger form submission.
+
−- name: dom.forms.submit.trusted_event_only
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref just controls whether we format the number with grouping separator
+
−# characters when the internal value is set or updated. It does not stop the
+
−# user from typing in a number and using grouping separators.
+
−- name: dom.forms.number.grouping
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether fullscreen should make the rest of the document inert.
+
−# This matches other browsers but historically not Gecko.
+
−- name: dom.fullscreen.modal
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the Gamepad API is enabled
+
−- name: dom.gamepad.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is Gamepad Extension API enabled?
+
−- name: dom.gamepad.extensions.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is LightIndicator API enabled in Gamepad Extension API?
+
−- name: dom.gamepad.extensions.lightindicator
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is MultiTouch API enabled in Gamepad Extension API?
+
−- name: dom.gamepad.extensions.multitouch
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is Gamepad vibrate haptic feedback function enabled?
+
−- name: dom.gamepad.haptic_feedback.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.gamepad.non_standard_events.enabled
+
−  type: bool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: always
+
−
+
−- name: dom.gamepad.test.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# W3C draft ImageCapture API
+
−- name: dom.imagecapture.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# <img loading="lazy">
+
−#
+
−# See https://github.com/whatwg/html/pull/3752
+
−- name: dom.image-lazy-loading.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The root margin for image lazy loading, defined as four (value, percentage)
+
−# pairs.
+
−- name: dom.image-lazy-loading.root-margin.top
+
−  type: float
+
−  value: 600
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.top.percentage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.bottom
+
−  type: float
+
−  value: 600
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.bottom.percentage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.left
+
−  type: float
+
−  value: 600
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.left.percentage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.right
+
−  type: float
+
−  value: 600
+
−  mirror: always
+
−
+
−- name: dom.image-lazy-loading.root-margin.right.percentage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable indexedDB in private browsing mode with encryption
+
−- name: dom.indexedDB.privateBrowsing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether or not indexedDB test mode is enabled.
+
−- name: dom.indexedDB.testing
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether or not indexedDB experimental features are enabled.
+
−- name: dom.indexedDB.experimental
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether or not indexedDB preprocessing is enabled.
+
−- name: dom.indexedDB.preprocessing
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether innerWidth / innerHeight return rounded or fractional sizes.
+
−#
+
−# NOTE(emilio): Fractional sizes are not web-compatible, see the regressions
+
−# from bug 1676843, but we want to expose the fractional sizes (probably in
+
−# another API) one way or another, see [1], so we're keeping the code for the
+
−# time being.
+
−#
+
−# [1]: https://github.com/w3c/csswg-drafts/issues/5260
+
−- name: dom.innerSize.rounded
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we conform to Input Events Level 1 or Input Events Level 2.
+
−# true:  conforming to Level 1
+
−# false: conforming to Level 2
+
−- name: dom.input_events.conform_to_level_1
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we allow BrowsingContextGroup to suspend input events
+
−- name: dom.input_events.canSuspendInBCG.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# The maximum time (milliseconds) we reserve for handling input events in each
+
−# frame.
+
−- name: dom.input_event_queue.duration.max
+
−  type: uint32_t
+
−  value: 8
+
−  mirror: always
+
−
+
−# Enable not moving the cursor to end when a text input or textarea has .value
+
−# set to the value it already has.  By default, enabled.
+
−- name: dom.input.skip_cursor_move_for_same_value_set
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.ipc.cancel_content_js_when_navigating
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# How often to check for CPOW timeouts (ms). CPOWs are only timed
+
−# out by the hang monitor.
+
−- name: dom.ipc.cpow.timeout
+
−  type: uint32_t
+
−  value: 500
+
−  mirror: always
+
−
+
−#ifdef MOZ_ENABLE_FORKSERVER
+
−- name: dom.ipc.forkserver.enable
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−#
+
−# Avoid the use of GTK in content processes if possible, by running
+
−# them in headless mode, to conserve resources (e.g., connections to
+
−# the X server).  See the usage in `ContentParent.cpp` for the full
+
−# definition of "if possible".
+
−#
+
−# This does not affect sandbox policies; content processes may still
+
−# dynamically connect to the display server for, e.g., WebGL.
+
−- name: dom.ipc.avoid-gtk
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# Whether or not to collect a paired minidump when force-killing a
+
−# content process.
+
−- name: dom.ipc.tabs.createKillHardCrashReports
+
−  type: bool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: once
+
−
+
−# Enable e10s hang monitoring (slow script checking and plugin hang detection).
+
−- name: dom.ipc.processHangMonitor
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether we report such process hangs
+
−- name: dom.ipc.reportProcessHangs
+
−  type: RelaxedAtomicBool
+
−# Don't report hangs in DEBUG builds. They're too slow and often a
+
−# debugger is attached.
+
−#ifdef DEBUG
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Process launch delay (in milliseconds).
+
−- name: dom.ipc.processPrelaunch.delayMs
+
−  type: uint32_t
+
−# This number is fairly arbitrary ... the intention is to put off
+
−# launching another app process until the last one has finished
+
−# loading its content, to reduce CPU/memory/IO contention.
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: dom.ipc.processPrelaunch.startupDelayMs
+
−  type: uint32_t
+
−# delay starting content processes for a short time after browser start
+
−# to provide time for the UI to come up
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Process preallocation cache
+
−# Only used in fission; in e10s we use 1 always
+
−- name: dom.ipc.processPrelaunch.fission.number
+
−  type: uint32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−# Limit preallocated processes below this memory size (in MB)
+
−- name: dom.ipc.processPrelaunch.lowmem_mb
+
−  type: uint32_t
+
−  value: 4096
+
−  mirror: always
+
−
+
−- name: dom.ipc.processPriorityManager.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.ipc.processPriorityManager.testMode
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.ipc.processPriorityManager.backgroundPerceivableGracePeriodMS
+
−  type: uint32_t
+
−#if defined(MOZ_WIDGET_ANDROID) && defined(NIGHTLY_BUILD)
+
−  value: 3000
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−- name: dom.ipc.processPriorityManager.backgroundGracePeriodMS
+
−  type: uint32_t
+
−#if defined(MOZ_WIDGET_ANDROID) && defined(NIGHTLY_BUILD)
+
−  value: 3000
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−#ifdef XP_WIN
+
−- name: dom.ipc.processPriorityManager.backgroundUsesEcoQoS
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−# Is support for HTMLElement.autocapitalize enabled?
+
−- name: dom.forms.autocapitalize
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Support for input type=month, type=week. By default, disabled.
+
−- name: dom.forms.datetime.others
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Is support for HTMLElement.enterKeyHint enabled?
+
−- name: dom.forms.enterkeyhint
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for HTMLElement.inputMode enabled?
+
−- name: dom.forms.inputmode
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.forms.always_allow_pointer_events.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Is support for key events and focus events on disabled elements enabled?
+
−- name: dom.forms.always_allow_key_and_focus_events.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to disable only the descendants or the parent fieldset element too
+
−# Note that this still allows it to be selected by `:disable`.
+
−- name: dom.forms.fieldset_disable_only_descendants.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to allow or disallow web apps to cancel `beforeinput` events caused
+
−# by MozEditableElement#setUserInput() which is used by autocomplete, autofill
+
−# and password manager.
+
−- name: dom.input_event.allow_to_cancel_set_user_input
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# How long a content process can take before closing its IPC channel
+
−# after shutdown is initiated.  If the process exceeds the timeout,
+
−# we fear the worst and kill it.
+
−- name: dom.ipc.tabs.shutdownTimeoutSecs
+
−  type: RelaxedAtomicUint32
+
−#if !defined(DEBUG) && !defined(MOZ_ASAN) && !defined(MOZ_VALGRIND) && !defined(MOZ_TSAN)
+
−  value: 20
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# Whether a native event loop should be used in the content process.
+
−- name: dom.ipc.useNativeEventProcessing.content
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN) || defined(XP_MACOSX)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# If this is true, TextEventDispatcher dispatches keydown and keyup events
+
−# even during composition (keypress events are never fired during composition
+
−# even if this is true).
+
−- name: dom.keyboardevent.dispatch_during_composition
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable/disable KeyboardEvent.initKeyEvent function
+
−- name: dom.keyboardevent.init_key_event.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable/disable KeyboardEvent.initKeyEvent function in addons even if it's
+
−# disabled.
+
−- name: dom.keyboardevent.init_key_event.enabled_in_addons
+
−  type: bool
+
−#if defined(RELEASE_OR_BETA)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# If this is true, keypress events for non-printable keys are dispatched only
+
−# for event listeners of the system event group in web content.
+
−- name: dom.keyboardevent.keypress.dispatch_non_printable_keys_only_system_group_in_content
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# If this is true, "keypress" event's keyCode value and charCode value always
+
−# become same if the event is not created/initialized by JS.
+
−- name: dom.keyboardevent.keypress.set_keycode_and_charcode_to_same_value
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether "W3C Web Manifest" processing is enabled
+
−- name: dom.manifest.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable mapped array buffer by default.
+
−- name: dom.mapped_arraybuffer.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Autoplay Policy Detection https://w3c.github.io/autoplay/
+
−- name: dom.media.autoplay-policy-detection.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Media Session API
+
−- name: dom.media.mediasession.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebCodecs API
+
−- name: dom.media.webcodecs.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Number of seconds of very quiet or silent audio before considering the audio
+
−# inaudible.
+
−- name: dom.media.silence_duration_for_audibility
+
−  type: AtomicFloat
+
−  value: 2.0f
+
−  mirror: always
+
−
+
−# Inform mozjemalloc that the foreground content processes can keep more dirty
+
−# pages in memory.
+
−- name: dom.memory.foreground_content_processes_have_larger_page_cache
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable meta-viewport support in remote APZ-enabled frames.
+
−- name: dom.meta-viewport.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Timeout clamp in ms for timeouts we clamp.
+
−- name: dom.min_timeout_value
+
−  type: RelaxedAtomicInt32
+
−  value: 4
+
−  mirror: always
+
−
+
−# Timeout clamp in ms for background windows.
+
−- name: dom.min_background_timeout_value
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Timeout clamp in ms for background windows when throttling isn't enabled.
+
−- name: dom.min_background_timeout_value_without_budget_throttling
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Are missing-property use counters for certain DOM attributes enabled?
+
−- name: dom.missing_prop_counters.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for import maps (<script type="importmap">) enabled for content?
+
−- name: dom.importMaps.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we disable triggering mutation events for changes to style
+
−# attribute via CSSOM.
+
−# NOTE: This preference is used in unit tests. If it is removed or its default
+
−# value changes, please update test_sharedMap_static_prefs.js accordingly.
+
−- name: dom.mutation-events.cssom.disabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Limit of location change caused by content scripts in a time span per
+
−# BrowsingContext. This includes calls to History and Location APIs.
+
−- name: dom.navigation.locationChangeRateLimit.count
+
−  type: uint32_t
+
−  value: 200
+
−  mirror: always
+
−
+
−# Time span in seconds for location change rate limit.
+
−- name: dom.navigation.locationChangeRateLimit.timespan
+
−  type: uint32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−# Network Information API
+
−# This feature is not available on Firefox desktop. It exposes too much
+
−# user information. Let's be consistent and disable it on Android.
+
−# But let's keep it around in case it becomes necessary for webcompat
+
−# reasons
+
−# https://bugzilla.mozilla.org/show_bug.cgi?id=1637922
+
−- name: dom.netinfo.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we should open noopener links in a new process.
+
−- name: dom.noopener.newprocess.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we shouldn't show an error page for unknown protocols (and should
+
−# show a console warning instead).
+
−- name: dom.no_unknown_protocol_error.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether origin trials are enabled.
+
−- name: dom.origin-trials.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we use the test key to verify tokens.
+
−- name: dom.origin-trials.test-key.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Origin trial state for "TestTrial".
+
−# 0: normal, 1: always-enabled, 2: always-disabled
+
−- name: dom.origin-trials.test-trial.state
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Origin trial state for COEP: Credentialless.
+
−# 0: normal, 1: always-enabled, 2: always-disabled
+
−- name: dom.origin-trials.coep-credentialless.state
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Is support for Window.paintWorklet enabled?
+
−- name: dom.paintWorklet.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable/disable the PaymentRequest API
+
−- name: dom.payments.request.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether a user gesture is required to call PaymentRequest.prototype.show().
+
−- name: dom.payments.request.user_interaction_required
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Time in milliseconds for PaymentResponse to wait for
+
−# the Web page to call complete().
+
−- name: dom.payments.response.timeout
+
−  type: uint32_t
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Enable printing performance marks/measures to log
+
−- name: dom.performance.enable_user_timing_logging
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable notification of performance timing
+
−- name: dom.performance.enable_notify_performance_timing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for PerformanceTiming.timeToContentfulPaint enabled?
+
−- name: dom.performance.time_to_contentful_paint.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for PerformanceTiming.timeToDOMContentFlushed enabled?
+
−- name: dom.performance.time_to_dom_content_flushed.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for PerformanceTiming.timeToFirstInteractive enabled?
+
−- name: dom.performance.time_to_first_interactive.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for PerformanceTiming.timeToNonBlankPaint enabled?
+
−- name: dom.performance.time_to_non_blank_paint.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for Permissions.revoke enabled?
+
−- name: dom.permissions.revoke.enable
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This enables width and height attributes and map these attributes to img
+
−# element's style.
+
−- name: dom.picture_source_dimension_attributes.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for Element.requestPointerLock enabled?
+
−# This is added for accessibility purpose. When user has no way to exit
+
−# pointer lock (e.g. no keyboard available), they can use this pref to
+
−# disable the Pointer Lock API altogether.
+
−- name: dom.pointer-lock.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# re-SAB: Whether to allow postMessage of a SharedArrayBuffer if various
+
−# preconditions related to COOP and COEP are met
+
−- name: dom.postMessage.sharedArrayBuffer.withCOOP_COEP
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Overridden in all.js on RELEASE_OR_BETA in order to add the locked attribute.
+
−- name: dom.postMessage.sharedArrayBuffer.bypassCOOP_COEP.insecure.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This currently only affects XHTML. For XUL the cache is always allowed.
+
−- name: dom.prototype_document_cache.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Push
+
−- name: dom.push.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# This enables the SVGPathSeg APIs
+
−- name: dom.svg.pathSeg.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Preference that is primarily used for testing of problematic file paths.
+
−# It can also be used for switching between different storage directories, but
+
−# such feature is not officially supported.
+
−- name: dom.quotaManager.storageName
+
−  type: String
+
−  value: "storage"
+
−  mirror: never
+
−
+
−# An upper limit for the "age" of an origin. Any origin which is older than the
+
−# threshold is considered as unaccessed. That doesn't necessarily mean that
+
−# such origins will be immediatelly archived. They will be archived only when
+
−# dom.quotaManager.checkQuotaInfoLoadTime is true and loading of quota info
+
−# takes a long time (dom.quotaManager.longQuotaInfoLoadTimeThresholdMs is used
+
−# to decide what is a long quota info load time).
+
−- name: dom.quotaManager.unaccessedForLongTimeThresholdSec
+
−  type: RelaxedAtomicUint32
+
−  value: 33696000 # 13 months
+
−  mirror: always
+
−
+
−# Should we try to load origin information from the cache?
+
−# See bug 1563023 for more details.
+
−- name: dom.quotaManager.loadQuotaFromCache
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Should we check build ID as part of the cache validation?
+
−# When enabled, the cache is invalidated on any upgrade (or downgrade),
+
−# ensuring that changes in how quota usage is calculated can't cause
+
−# inconsistencies at the cost of a slower initialization. Currently, this
+
−# should only be set to false in tests using a packaged profile that inherently
+
−# includes a build id different from the building running the tests. In the
+
−# future this may be set to false if we are confident that we have sufficiently
+
−# thorough schema versioning.
+
−- name: dom.quotaManager.caching.checkBuildId
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Should we check quota info load time and eventually archive some unaccessed
+
−# origins if loading of quota info takes a long time ?
+
−- name: dom.quotaManager.checkQuotaInfoLoadTime
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# An upper limit for quota info load time, anything which takes longer than the
+
−# threshold is considered as long quota info load time.
+
−- name: dom.quotaManager.longQuotaInfoLoadTimeThresholdMs
+
−  type: RelaxedAtomicUint32
+
−  value: 21000 # 21 seconds
+
−  mirror: always
+
−
+
−# Preference that users can set to override temporary storage smart limit
+
−# calculation.
+
−- name: dom.quotaManager.temporaryStorage.fixedLimit
+
−  type: RelaxedAtomicInt32
+
−  value: -1
+
−  mirror: always
+
−
+
−# A pref that is used to enable testing features.
+
−- name: dom.quotaManager.testing
+
−  type: SequentiallyConsistentAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#if defined(XP_WIN)
+
−  # Preference that is used to set nsILocalFileWin::useDOSDevicePathSyntax
+
−  # attribute for all local file instances created by QuotaManager and its
+
−  # clients. The value of this preference is cached so changing the preference
+
−  # during runtime has no effect.
+
−  # See bug 1626846 for setting this to false by default.
+
−-   name: dom.quotaManager.useDOSDevicePathSyntax
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−    do_not_use_directly: true
+
−
+
−  # Preference that is used to enable the hack for overrriding xFullPathname in
+
−  # QuotaVFS.
+
−-   name: dom.quotaManager.overrideXFullPathname
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−#elif defined(XP_UNIX)
+
−  # Preference that is used to enable the overriding of Unix xFullPathname
+
−  # implementation in QuotaVFS.
+
−-   name: dom.quotaManager.overrideXFullPathnameUnix
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−#endif
+
−
+
−# How many times we should retry directory removal or renaming if access was
+
−# denied?
+
−- name: dom.quotaManager.directoryRemovalOrRenaming.maxRetries
+
−  type: RelaxedAtomicUint32
+
−#ifdef XP_WIN
+
−  value: 10
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# How long we should wait between retries (in milliseconds)?
+
−- name: dom.quotaManager.directoryRemovalOrRenaming.delayMs
+
−  type: RelaxedAtomicUint32
+
−  value: 200
+
−  mirror: always
+
−
+
−#ifdef MOZ_BACKGROUNDTASKS
+
−# Use a Background Task to delete files at shutdown.
+
−- name: dom.quotaManager.backgroundTask.enabled
+
−  type: bool
+
−#ifdef XP_MACOSX
+
−# Needs to figure out how to prevent bug 1827486.
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: never
+
−#endif
+
−
+
−# Use to control to dump CheckedUnsafePtr creation stack and assignment stacks.
+
−- name: dom.checkedUnsafePtr.dumpStacks.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Determines within what distance of a tick mark, in pixels, dragging an input
+
−# range range will snap the range's value to that tick mark. By default, this is
+
−# half the default width of the range thumb.
+
−- name: dom.range_element.magnet_effect_threshold
+
−  type: float
+
−  value: 10.0f
+
−  mirror: always
+
−
+
−# Reporting API.
+
−- name: dom.reporting.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.reporting.testing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.reporting.featurePolicy.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.reporting.crash.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.reporting.header.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# In seconds. The timeout to remove not-active report-to endpoints.
+
−- name: dom.reporting.cleanup.timeout
+
−  type: uint32_t
+
−  value: 3600
+
−  mirror: always
+
−
+
−# Any X seconds the reports are dispatched to endpoints.
+
−- name: dom.reporting.delivering.timeout
+
−  type: uint32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−# How many times the delivering of a report should be tried.
+
−- name: dom.reporting.delivering.maxFailures
+
−  type: uint32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−# How many reports should be stored in the report queue before being delivered.
+
−- name: dom.reporting.delivering.maxReports
+
−  type: uint32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# Enable Screen Orientation lock
+
−- name: dom.screenorientation.allow-lock
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to enable the JavaScript start-up cache. This causes one of the first
+
−# execution to record the bytecode of the JavaScript function used, and save it
+
−# in the existing cache entry. On the following loads of the same script, the
+
−# bytecode would be loaded from the cache instead of being generated once more.
+
−- name: dom.script_loader.bytecode_cache.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Ignore the heuristics of the bytecode cache, and always record on the first
+
−# visit. (used for testing purposes).
+
−
+
−# Choose one strategy to use to decide when the bytecode should be encoded and
+
−# saved. The following strategies are available right now:
+
−#   * -2 : (reader mode) The bytecode cache would be read, but it would never
+
−#          be saved.
+
−#   * -1 : (eager mode) The bytecode would be saved as soon as the script is
+
−#          seen for the first time, independently of the size or last access
+
−#          time.
+
−#   *  0 : (default) The bytecode would be saved in order to minimize the
+
−#          page-load time.
+
−#
+
−# Other values might lead to experimental strategies. For more details, have a
+
−# look at: ScriptLoader::ShouldCacheBytecode function.
+
−- name: dom.script_loader.bytecode_cache.strategy
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# Select which parse/delazification strategy should be used while parsing
+
−# scripts off-main-thread. (see CompileOptions.h, DelazificationOption enum)
+
−#
+
−#   0: On-demand only. Delazification will be triggered only on the main thread
+
−#      before the execution of the function.
+
−#
+
−#   1: Compare on-demand delazification (= 0) with concurrent depth-first
+
−#      delazification (= 2).
+
−#
+
−#   2: Depth-first. Delazify all functions off-thread in the order of appearance
+
−#      in the source.
+
−#
+
−#   3: Large-first. Delazify all functions off-thread starting with the largest
+
−#      functions first, and the smallest as the last one to be delazified, where
+
−#      the size of function is measured in bytes between the start to the end of
+
−#      the function.
+
−#
+
−# 255: Parse everything eagerly, from the first parse. All functions are parsed
+
−#      at the same time as the top-level of a file.
+
−- name: dom.script_loader.delazification.strategy
+
−  type: uint32_t
+
−  value: 255
+
−  mirror: always
+
−
+
−# Maximum total size after which the delazification strategy, specified by
+
−# `dom.script_loader.delazification.strategy`, is no longer applied, and the
+
−# on-demand strategy is used by default.
+
−#
+
−# -1 disable the threshold, and delazification strategy is applied to all
+
−# scripts.
+
−#
+
−# Default value is 10MB for utf8 scripts.
+
−- name: dom.script_loader.delazification.max_size
+
−  type: int32_t
+
−  value: 10485760
+
−  mirror: always
+
−
+
−# Minimum memory, in GB, required to enable delazification strategy, specified
+
−# by `dom.script_loader.delazification.strategy`. Otherwise, the on-demand
+
−# delazification strategy is used.
+
−- name: dom.script_loader.delazification.min_mem
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Is support for decoding external (non-inline) classic or module DOM scripts
+
−# (i.e. anything but workers) as UTF-8, then directly compiling without
+
−# inflating to UTF-16, enabled?
+
−- name: dom.script_loader.external_scripts.utf8_parsing.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable  speculative off main thread parsing of external scripts as
+
−# soon as they are fetched.
+
−- name: dom.script_loader.external_scripts.speculative_omt_parse.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Speculatively compile non parser inserted scripts
+
−- name: dom.script_loader.external_scripts.speculate_non_parser_inserted.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Speculatively compile async scripts
+
−- name: dom.script_loader.external_scripts.speculate_async.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Speculatively compile link preload scripts
+
−- name: dom.script_loader.external_scripts.speculate_link_preload.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.securecontext.allowlist_onions
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref enables the featurePolicy header support.
+
−- name: dom.security.featurePolicy.header.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.security.featurePolicy.experimental.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Expose the 'featurePolicy' attribute in document and HTMLIFrameElement
+
−- name: dom.security.featurePolicy.webidl.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Perform IPC based Principal vetting in ContentParent
+
−- name: dom.security.enforceIPCBasedPrincipalVetting
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# For testing purposes only: Flipping this pref to true allows
+
−# to skip the allowlist for about: pages and do not ship with a
+
−# CSP and NS_ASSERT right away.
+
−- name: dom.security.skip_about_page_csp_allowlist_and_assert
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# For testing purposes only: Flipping this pref to true allows
+
−# to skip the assertion that every about page ships with a CSP.
+
−- name: dom.security.skip_about_page_has_csp_assert
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# For testing purposes only: Flipping this pref to true allows
+
−# to skip the assertion that HTML fragments (e.g. innerHTML) can
+
−# not be used within chrome code or about: pages.
+
−- name: dom.security.skip_html_fragment_assertion
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# For testing purposes only; Flipping this pref to true allows
+
−# to skip the assertion that remote scripts can not be loaded
+
−# in system privileged contexts.
+
−- name: dom.security.skip_remote_script_assertion_in_system_priv_context
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, all content requests will get upgraded to HTTPS://
+
−# (some Firefox functionality requests, like OCSP will not be affected)
+
−- name: dom.security.https_only_mode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, all content requests in Private Browsing Mode will get
+
−# upgraded to HTTPS://. (If dom.security.https_only_mode is set
+
−# to true then this pref has no effect)
+
−- name: dom.security.https_only_mode_pbm
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, sends http background request for top-level sites to
+
−# counter long timeouts.
+
−- name: dom.security.https_only_mode_send_http_background_request
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Time limit, in milliseconds, before sending the http background
+
−# request for HTTPS-Only and HTTPS-First
+
−- name: dom.security.https_only_fire_http_request_background_timer_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 3000
+
−  mirror: always
+
−
+
−# If true, tries to break upgrade downgrade cycles where https-only tries
+
−# to upgrad ethe connection, but the website tries to downgrade again.
+
−- name: dom.security.https_only_mode_break_upgrade_downgrade_endless_loop
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If true, when checking if it's upgrade downgrade cycles, the URI path will be
+
−# also checked.
+
−- name: dom.security.https_only_check_path_upgrade_downgrade_endless_loop
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If true and HTTPS-only mode is enabled, requests
+
−# to local IP addresses are also upgraded
+
−- name: dom.security.https_only_mode.upgrade_local
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true and HTTPS-only mode is enabled, requests
+
−# to .onion hosts are also upgraded
+
−- name: dom.security.https_only_mode.upgrade_onion
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# WARNING: Don't ever update that pref manually! It is only used
+
−# for telemetry purposes and allows to reason about retention of
+
−# the pref dom.security.https_only_mode from above.
+
−- name: dom.security.https_only_mode_ever_enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# WARNING: Don't ever update that pref manually! It is only used
+
−# for telemetry purposes and allows to reason about retention of
+
−# the pref dom.security.https_only_mode_pbm from above.
+
−- name: dom.security.https_only_mode_ever_enabled_pbm
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true checks for secure www connections when https fails
+
−# and gives the user suggestions on the error page
+
−- name: dom.security.https_only_mode_error_page_user_suggestions
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, top-level request will get upgraded to HTTPS and
+
−# downgraded again if the request failed.
+
−- name: dom.security.https_first
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, top-level requests in Private Browsing Mode will get
+
−# upgraded to HTTPS. (If dom.security.https_first
+
−# is set to true then this pref has no effect)
+
−- name: dom.security.https_first_pbm
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.security.unexpected_system_load_telemetry_enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# pref controls `Sanitizer` API being exposed
+
−# https://wicg.github.io/sanitizer-api/
+
−- name: dom.security.sanitizer.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref that controls the Element.setHTML API idenpendetly of the sanitizer
+
−# API.
+
−- name: dom.security.setHTML.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Logs elements and attributes removed by the Sanitizer API to the console.
+
−- name: dom.security.sanitizer.logging
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# pref controls `identity` credentials being exposed
+
−- name: dom.security.credentialmanagement.identity.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# pref controls `identity` credential UI for testing. When true, UI is not shown and
+
−# the first option in the account and provider lists are chosen
+
−- name: dom.security.credentialmanagement.identity.select_first_in_ui_lists
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# pref controls `identity` credential platform behavior for testing. When true,
+
−# the .well-known file check is not performed.
+
−- name: dom.security.credentialmanagement.identity.test_ignore_well_known
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# pref controls whether we should delay identity credential rejections at all
+
−- name: dom.security.credentialmanagement.identity.reject_delay.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# pref controls how long we should delay identity credential rejections if enabled
+
−- name: dom.security.credentialmanagement.identity.reject_delay.duration_ms
+
−  type: uint32_t
+
−  value: 120000
+
−  mirror: always
+
−
+
−# Whether or not selection events on text controls are enabled.
+
−- name: dom.select_events.textcontrols.selectionchange.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.select_events.textcontrols.selectstart.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.separate_event_queue_for_post_message.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.arena_allocator.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: dom.serviceWorkers.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.serviceWorkers.navigationPreload.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Mitigates ServiceWorker navigation faults by bypassing the ServiceWorker on
+
−# navigation faults.  This is more extensive than just resetting interception
+
−# because we also mark the page as uncontrolled so that subresources will not
+
−# go to the ServiceWorker either.
+
−- name: dom.serviceWorkers.mitigations.bypass_on_fault
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Additional ServiceWorker navigation mitigation control to unregister the
+
−# ServiceWorker after multiple faults are encountered. The mitigation is
+
−# disabled when this is set to zero, otherwise this is the number of faults that
+
−# need to occur for a specific ServiceWorker before it will be unregistered.
+
−- name: dom.serviceWorkers.mitigations.navigation_fault_threshold
+
−  type: uint32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−# This is the group usage head room for service workers.
+
−# The quota usage mitigation algorithm uses this preference to determine if the
+
−# origin or also group data should be cleared or not.
+
−# The default value is 400 MiB.
+
−- name: dom.serviceWorkers.mitigations.group_usage_headroom_kb
+
−  type: uint32_t
+
−  value: 400 * 1024
+
−  mirror: always
+
−
+
−- name: dom.serviceWorkers.testing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether ServiceWorkerManager should persist the service worker
+
−# registered by temporary installed extension (only meant to be used
+
−# for testing purpose, to make it easier to test some particular scenario
+
−# with a temporary installed addon, which doesn't need to be signed to be
+
−# installed on release channel builds).
+
−- name: dom.serviceWorkers.testing.persistTemporarilyInstalledAddons
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.storage.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# ReadableStream.from(asyncIterable)
+
−- name: dom.streams.from.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.workers.pFetch.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.workers.importScripts.enforceStrictMimeType
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Is support for modules (new Worker(..., {type: "module"})) enabled for workers?
+
−- name: dom.workers.modules.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.workers.requestAnimationFrame
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.workers.serialized-sab-access
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable stronger diagnostics on worker shutdown.
+
−# If this is true, we will potentially run an extra GCCC when a  worker should
+
−# exit its DoRunLoop but holds any WorkerRef and we will MOZ_DIAGNOSTIC_ASSERT
+
−# when during that extra GCCC such a WorkerRef is freed.
+
−- name: dom.workers.GCCC_on_potentially_last_event
+
−  type: RelaxedAtomicBool
+
−#if defined(FUZZING) || defined(DEBUG)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: dom.sitepermsaddon-provider.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# Whether automatic storage access granting heuristics should be turned on.
+
−- name: dom.storage_access.auto_grants
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.storage_access.auto_grants.delayed
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Storage-access API.
+
−- name: dom.storage_access.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Forward-Declared Storage-access API.
+
−- name: dom.storage_access.forward_declared.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# How long the Forward-Declared Storage-access API allows between pair requests
+
−# in seconds
+
−- name: dom.storage_access.forward_declared.lifetime
+
−  type: uint32_t
+
−  value: 15 * 60
+
−  mirror: always
+
−
+
−# The maximum number of origins that a given third-party tracker is allowed
+
−# to have concurrent access to before the user is presented with a storage
+
−# access prompt.  Only effective when the auto_grants pref is turned on.
+
−- name: dom.storage_access.max_concurrent_auto_grants
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−- name: dom.storage_access.frame_only
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the Storage API is enabled.
+
−- name: dom.storageManager.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the File System API is enabled
+
−- name: dom.fs.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the WritableFileStream is enabled or disabled.
+
−- name: dom.fs.writable_file_stream.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# LocalStorage data limit as determined by summing up the lengths of all string
+
−# keys and values. This is consistent with the legacy implementation and other
+
−# browser engines. This value should really only ever change in unit testing
+
−# where being able to lower it makes it easier for us to test certain edge
+
−# cases. Measured in KiBs.
+
−- name: dom.storage.default_quota
+
−  type: RelaxedAtomicUint32
+
−  # Only allow relatively small amounts of data since performance of the
+
−  # synchronous IO is very bad. We are enforcing simple per-origin quota only.
+
−  value: 5 * 1024
+
−  mirror: always
+
−
+
−# Per-site quota for legacy LocalStorage implementation.
+
−- name: dom.storage.default_site_quota
+
−  type: RelaxedAtomicUint32
+
−  value: 25 * 1024
+
−  mirror: always
+
−
+
−# Whether or not the unsupported legacy implemenation should be enabled. Please
+
−# don't advertise this pref as a way for disabling LSNG. This pref is intended
+
−# for internal testing only and will be removed in near future. Accidental
+
−# disabling of LSNG can lead to a data loss in a combination with disabled
+
−# shadow writes. Disabling of shadow writes is the initial step towards
+
−# removing legacy implementation and will be done soon.
+
−- name: dom.storage.enable_unsupported_legacy_implementation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# The amount of snapshot peak usage which is attempted to be pre-incremented
+
−# during snapshot creation.
+
−- name: dom.storage.snapshot_peak_usage.initial_preincrement
+
−  type: RelaxedAtomicUint32
+
−  value: 16384
+
−  mirror: always
+
−
+
−# The amount of snapshot peak usage which is attempted to be pre-incremented
+
−# during snapshot creation if the LocalStorage usage was already close to the
+
−# limit (a fallback for dom.storage.snapshot_peak_usage.initial_preincrement).
+
−- name: dom.storage.snapshot_peak_usage.reduced_initial_preincrement
+
−  type: RelaxedAtomicUint32
+
−  value: 4096
+
−  mirror: always
+
−
+
−# The amount of snapshot peak usage which is attempted to be pre-incremented
+
−# beyond the specific values which are subsequently requested after snapshot
+
−# creation.
+
−- name: dom.storage.snapshot_peak_usage.gradual_preincrement
+
−  type: RelaxedAtomicUint32
+
−  value: 4096
+
−  mirror: always
+
−
+
−# The amount of snapshot peak usage which is attempted to be pre-incremented
+
−# beyond the specific values which are subsequently requested after snapshot
+
−# creation if the LocalStorage total usage was already close to the limit
+
−# (a fallback for dom.storage.snapshot_peak_usage.gradual_preincrement).
+
−- name: dom.storage.snapshot_peak_usage.reduced_gradual_preincrement
+
−  type: RelaxedAtomicUint32
+
−  value: 1024
+
−  mirror: always
+
−
+
−# How long between a snapshot becomes idle and when we actually finish the
+
−# snapshot. This preference is only used when "dom.storage.snapshot_reusing"
+
−# is true.
+
−- name: dom.storage.snapshot_idle_timeout_ms
+
−  type: uint32_t
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Is support for Storage test APIs enabled?
+
−- name: dom.storage.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# For area and anchor elements with target=_blank and no rel set to
+
−# opener/noopener.
+
−- name: dom.targetBlankNoOpener.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for Selection.GetRangesForInterval enabled?
+
−- name: dom.testing.selection.GetRangesForInterval
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.testing.structuredclonetester.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.testing.sync-content-blocking-notifications
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# To enable TestUtils interface on WPT
+
−- name: dom.testing.testutils.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.textMetrics.actualBoundingBox.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.textMetrics.baselines.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.textMetrics.emHeight.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.textMetrics.fontBoundingBox.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Time (in ms) that it takes to regenerate 1ms.
+
−- name: dom.timeout.background_budget_regeneration_rate
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# Time (in ms) that it takes to regenerate 1ms.
+
−- name: dom.timeout.foreground_budget_regeneration_rate
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Maximum value (in ms) for the background budget. Only valid for
+
−# values greater than 0.
+
−- name: dom.timeout.background_throttling_max_budget
+
−  type: int32_t
+
−  value: 50
+
−  mirror: always
+
−
+
−# Maximum value (in ms) for the foreground budget. Only valid for
+
−# values greater than 0.
+
−- name: dom.timeout.foreground_throttling_max_budget
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# The maximum amount a timeout can be delayed by budget throttling.
+
−- name: dom.timeout.budget_throttling_max_delay
+
−  type: int32_t
+
−  value: 15000
+
−  mirror: always
+
−
+
−# Turn on budget throttling by default.
+
−- name: dom.timeout.enable_budget_timer_throttling
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Should we defer timeouts and intervals while loading a page.  Released
+
−# on Idle or when the page is loaded.
+
−- name: dom.timeout.defer_during_load
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Maximum amount of time in milliseconds consecutive setTimeout()/setInterval()
+
−# callback are allowed to run before yielding the event loop.
+
−- name: dom.timeout.max_consecutive_callbacks_ms
+
−  type: uint32_t
+
−  value: 4
+
−  mirror: always
+
−
+
−# Maximum deferral time for setTimeout/Interval in milliseconds
+
−- name: dom.timeout.max_idle_defer_ms
+
−  type: uint32_t
+
−  value: 10*1000
+
−  mirror: always
+
−
+
−# Delay in ms from document load until we start throttling background timeouts.
+
−- name: dom.timeout.throttling_delay
+
−  type: int32_t
+
−  value: 30000
+
−  mirror: always
+
−
+
−# UDPSocket API
+
−- name: dom.udpsocket.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to dump worker use counters
+
−- name: dom.use_counters.dump.worker
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to dump document use counters
+
−- name: dom.use_counters.dump.document
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to dump page use counters
+
−- name: dom.use_counters.dump.page
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Time limit, in milliseconds, for user gesture transient activation.
+
−- name: dom.user_activation.transient.timeout
+
−  type: uint32_t
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Whether to treat the clicks on scrollbars as user interaction with web content.
+
−- name: dom.user_activation.ignore_scrollbars
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to shim a Components object on untrusted windows.
+
−- name: dom.use_components_shim
+
−  type: bool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−- name: dom.vibrator.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.vibrator.max_vibrate_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 10000
+
−  mirror: always
+
−
+
−- name: dom.vibrator.max_vibrate_list_len
+
−  type: RelaxedAtomicUint32
+
−  value: 128
+
−  mirror: always
+
−
+
−# Is support for Window.visualViewport enabled?
+
−- name: dom.visualviewport.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for WebVR APIs enabled?
+
−# Disabled everywhere, but not removed.
+
−- name: dom.vr.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Should VR sessions always be reported as supported, without first
+
−# checking for VR runtimes?  This will prevent permission prompts
+
−# from being suppressed on machines without VR runtimes and cause
+
−# navigator.xr.isSessionSupported to always report that immersive-vr
+
−# is supported.
+
−- name: dom.vr.always_support_vr
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Should AR sessions always be reported as supported, without first
+
−# checking for AR runtimes?  This will prevent permission prompts
+
−# from being suppressed on machines without AR runtimes and cause
+
−# navigator.xr.isSessionSupported to always report that immersive-ar
+
−# is supported.
+
−- name: dom.vr.always_support_ar
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# It is often desirable to automatically start vr presentation when
+
−# a user puts on the VR headset.  This is done by emitting the
+
−# Window.vrdisplayactivate event when the headset's sensors detect it
+
−# being worn.  This can result in WebVR content taking over the headset
+
−# when the user is using it outside the browser or inadvertent start of
+
−# presentation due to the high sensitivity of the proximity sensor in some
+
−# headsets, so it is off by default.
+
−- name: dom.vr.autoactivate.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds that the browser will wait before
+
−# attempting to poll again for connected VR controllers.  The browser
+
−# will not attempt to poll for VR controllers until it needs to use them.
+
−- name: dom.vr.controller.enumerate.interval
+
−  type: RelaxedAtomicInt32
+
−  value: 1000
+
−  mirror: always
+
−
+
−# The threshold value of trigger inputs for VR controllers.
+
−- name: dom.vr.controller_trigger_threshold
+
−  type: AtomicFloat
+
−  value: 0.1f
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds that the browser will wait before
+
−# attempting to poll again for connected VR displays.  The browser
+
−# will not attempt to poll for VR displays until it needs to use
+
−# them, such as when detecting a WebVR site.
+
−- name: dom.vr.display.enumerate.interval
+
−  type: RelaxedAtomicInt32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# The number of milliseconds since last frame start before triggering a new
+
−# frame. When content is failing to submit frames on time or the lower level
+
−# VR platform APIs are rejecting frames, it determines the rate at which RAF
+
−# callbacks will be called.
+
−- name: dom.vr.display.rafMaxDuration
+
−  type: RelaxedAtomicUint32
+
−  value: 50
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds the browser will wait before attempting
+
−# to re-start the VR service after an enumeration returned no devices.
+
−- name: dom.vr.external.notdetected.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 60000
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds the browser will wait before attempting
+
−# to re-start the VR service after a VR API (eg, OpenVR or Oculus)
+
−# requests that we shutdown and unload its libraries.
+
−# To ensure that we don't interfere with VR runtime software auto-updates,
+
−# we will not attempt to re-load the service until this timeout has elapsed.
+
−- name: dom.vr.external.quit.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 10000
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds that the VR session will be kept
+
−# alive after the browser and content no longer are using the
+
−# hardware.  If a VR multitasking environment, this should be set
+
−# very low or set to 0.
+
−- name: dom.vr.inactive.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Maximum number of milliseconds the browser will wait for content to call
+
−# VRDisplay.requestPresent after emitting vrdisplayactivate during VR
+
−# link traversal.  This prevents a long running event handler for
+
−# vrdisplayactivate from later calling VRDisplay.requestPresent, which would
+
−# result in a non-responsive browser in the VR headset.
+
−- name: dom.vr.navigation.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Oculus device
+
−- name: dom.vr.oculus.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(HAVE_64BIT_BUILD) && !defined(ANDROID)
+
−  # We are only enabling WebVR by default on 64-bit builds (Bug 1384459).
+
−  value: true
+
−#else
+
−  # On Android, this pref is irrelevant.
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# When enabled, Oculus sessions may be created with the ovrInit_Invisible
+
−# flag if a page is using tracking but not presenting.  When a page
+
−# begins presenting VR frames, the session will be re-initialized without
+
−# the flag.  This eliminates the "Firefox not responding" warnings in
+
−# the headset, but might not be compatible with all versions of the Oculus
+
−# runtime.
+
−- name: dom.vr.oculus.invisible.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Minimum number of milliseconds after content has stopped VR presentation
+
−# before the Oculus session is re-initialized to an invisible / tracking
+
−# only mode.  If this value is too high, users will need to wait longer
+
−# after stopping WebVR presentation before automatically returning to the
+
−# Oculus home interface.  (They can immediately return to the Oculus Home
+
−# interface through the Oculus HUD without waiting this duration)
+
−# If this value is too low, the Oculus Home interface may be visible
+
−# momentarily during VR link navigation.
+
−- name: dom.vr.oculus.present.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 500
+
−  mirror: always
+
−
+
−# OpenVR device
+
−- name: dom.vr.openvr.enabled
+
−  type: RelaxedAtomicBool
+
−#if !defined(HAVE_64BIT_BUILD) && !defined(ANDROID)
+
−  # We are only enabling WebVR by default on 64-bit builds (Bug 1384459).
+
−  value: false
+
−#elif defined(XP_WIN) || defined(XP_MACOSX)
+
−  # We enable OpenVR by default for Windows and macOS.
+
−  value: true
+
−#else
+
−  # See Bug 1310663 (Linux).  On Android, this pref is irrelevant.
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# OSVR device
+
−- name: dom.vr.osvr.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pose prediction reduces latency effects by returning future predicted HMD
+
−# poses to callers of the WebVR API.  This currently only has an effect for
+
−# Oculus Rift on SDK 0.8 or greater.
+
−- name: dom.vr.poseprediction.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable a separate process for VR module.
+
−- name: dom.vr.process.enabled
+
−  type: bool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: dom.vr.process.startup_timeout_ms
+
−  type: int32_t
+
−  value: 5000
+
−  mirror: once
+
−
+
−# Puppet device, used for simulating VR hardware within tests and dev tools.
+
−- name: dom.vr.puppet.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Starting VR presentation is only allowed within a user gesture or event such
+
−# as VRDisplayActivate triggered by the system. dom.vr.require-gesture allows
+
−# this requirement to be disabled for special cases such as during automated
+
−# tests or in a headless kiosk system.
+
−- name: dom.vr.require-gesture
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for WebXR APIs enabled?
+
−- name: dom.vr.webxr.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Points in the native bounds geometry are required to be quantized
+
−# sufficiently to prevent fingerprinting. The WebXR spec suggests
+
−# quantizing to the nearest 5 centimeters.
+
−- name: dom.vr.webxr.quantization
+
−  type: AtomicFloat
+
−  value: 0.05f
+
−  mirror: always
+
−
+
−# Whether MouseEvent.region is exposed as a property.
+
−- name: dom.mouse_event.region.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef XP_WIN
+
−  # Control firing WidgetMouseEvent by handling Windows pointer messages or
+
−  # mouse messages.
+
−-   name: dom.w3c_pointer_events.dispatch_by_pointer_messages
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: dom.w3c_pointer_events.scroll_by_pen.enabled
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−#endif
+
−
+
−# If the value is >= 0, it will be used for max touch points in child processes.
+
−- name: dom.maxtouchpoints.testing.value
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# Maximum value of navigator.hardwareConcurrency.
+
−- name: dom.maxHardwareConcurrency
+
−  type: RelaxedAtomicUint32
+
−#ifdef NIGHTLY_BUILD
+
−  value: 128
+
−#else
+
−  value: 16
+
−#endif
+
−  mirror: always
+
−
+
−# W3C pointer events draft.
+
−- name: dom.w3c_pointer_events.implicit_capture
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# In case Touch API is enabled, this pref controls whether to support
+
−# ontouch* event handlers, document.createTouch, document.createTouchList and
+
−# document.createEvent("TouchEvent").
+
−- name: dom.w3c_touch_events.legacy_apis.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# W3C touch events
+
−# 0 - disabled, 1 - enabled, 2 - autodetect
+
−# Autodetection is currently only supported on Windows and GTK3 (and assumed on
+
−# Android).
+
−- name: dom.w3c_touch_events.enabled
+
−  type: int32_t
+
−#if defined(XP_MACOSX)
+
−  value: 0
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−# Is support for the Web Audio API enabled?
+
−- name: dom.webaudio.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.webkitBlink.dirPicker.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# Is the 'assign' API for slot element enabled?
+
−- name: dom.shadowdom.slot.assign.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# NOTE: This preference is used in unit tests. If it is removed or its default
+
−# value changes, please update test_sharedMap_static_prefs.js accordingly.
+
−- name: dom.webcomponents.shadowdom.report_usage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for the Web GPU API enabled?
+
−- name: dom.webgpu.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Are WebGPU indirect draws/dispatches enabled?
+
−- name: dom.webgpu.indirect-dispatch.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Comma-separated list of wgpu backend names to permit in WebGPU adapters.
+
−#
+
−# If non-empty, this is parsed by `wgpu_core::instance::parse_backends_from_comma_list` to
+
−# produce a `wgpu_types::Backends` bitset used to create a `wgpu_core::hub::Global`. As of
+
−# 2023-3-22, recognized names are:
+
−#
+
−#     "vulkan" | "vk" => Backends::VULKAN,
+
−#     "dx12" | "d3d12" => Backends::DX12,
+
−#     "dx11" | "d3d11" => Backends::DX11,
+
−#     "metal" | "mtl" => Backends::METAL,
+
−#     "opengl" | "gles" | "gl" => Backends::GL,
+
−#     "webgpu" => Backends::BROWSER_WEBGPU,
+
−- name: dom.webgpu.wgpu-backend
+
−  type: DataMutexString
+
−  value: ""
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for HTMLInputElement.webkitEntries enabled?
+
−- name: dom.webkitBlink.filesystem.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# Whether the Web Locks API is enabled
+
−- name: dom.weblocks.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the WebMIDI API is enabled
+
−- name: dom.webmidi.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# midi permission is addon-gated
+
−- name: dom.webmidi.gated
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.allowcrossoriginiframe
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.requireuserinteraction
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.requireinteraction.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: @IS_NIGHTLY_BUILD@
+
−#endif
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.silent.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−- name: dom.webnotifications.vibrate.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: @IS_NIGHTLY_BUILD@
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Is support for Window.event enabled?
+
−- name: dom.window.event.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.window.clientinformation.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.window.sidebar.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether Window.sizeToContent() is enabled.
+
−- name: dom.window.sizeToContent.enabled
+
−  type: bool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−- name: dom.worker.canceling.timeoutMilliseconds
+
−  type: RelaxedAtomicUint32
+
−  value: 30000    # 30 seconds
+
−  mirror: always
+
−
+
−# Is support for compiling DOM worker scripts directly from UTF-8 (without ever
+
−# inflating to UTF-16) enabled?
+
−- name: dom.worker.script_loader.utf8_parsing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.worker.use_medium_high_event_queue
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables the dispatching of console log events from worker threads to the
+
−# main-thread.
+
−- name: dom.worker.console.dispatch_events_to_main_thread
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.workers.testing.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When this pref is set, parent documents may consider child iframes have
+
−# loaded while they are still loading.
+
−- name: dom.cross_origin_iframes_loaded_in_background
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# WebIDL test prefs.
+
−- name: dom.webidl.test1
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−- name: dom.webidl.test2
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.webidl.crosscontext_hasinstance.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# WebShare API - exposes navigator.share()
+
−- name: dom.webshare.enabled
+
−  type: bool
+
−#ifdef XP_WIN
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# WebShare API - allows WebShare without user interaction (for tests only).
+
−- name: dom.webshare.requireinteraction
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# about:home and about:newtab include remote snippets that contain arbitrarily
+
−# placed anchor tags in their content; we want sanitization to be turned off
+
−# in order to render them correctly
+
−- name: dom.about_newtab_sanitization.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Hide the confirm dialog when a POST request is reloaded.
+
−- name: dom.confirm_repost.testing.always_accept
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we should suspend inactive tabs or not
+
−- name: dom.suspend_inactive.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# The following three prefs control the maximum script run time before slow
+
−# script warning.
+
−
+
−# Controls the time that a content script can run before showing a
+
−# notification.
+
−- name: dom.max_script_run_time
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−# Controls whether we want to wait for user input before surfacing notifying
+
−# the parent process about a long-running script.
+
−- name: dom.max_script_run_time.require_critical_input
+
−  type: bool
+
−# On desktop, we don't want to annoy the user with a notification if they're
+
−# not interacting with the browser. On Android however, we automatically
+
−# terminate long-running scripts, so we want to make sure we don't get in the
+
−# way of that by waiting for input.
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Controls if a content script will be aborted on child process shutdown.
+
−- name: dom.abort_script_on_child_shutdown
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: dom.max_chrome_script_run_time
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: dom.max_ext_content_script_run_time
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−# Initialize Resize Observer's last reported size to -1x-1, and not 0x0,
+
−# as per CSSWG resolution: https://github.com/w3c/csswg-drafts/issues/3664
+
−- name: dom.resize_observer.last_reported_size_invalid
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Let Resize Observer report the size of all fragments, and not just the
+
−# first one, as per CSSWG resolution:
+
−# https://github.com/w3c/csswg-drafts/issues/3673#issuecomment-467221565
+
−- name: dom.resize_observer.support_fragments
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "editor"
+
−#---------------------------------------------------------------------------
+
−
+
−# Default background color of HTML editor.  This is referred only when
+
−# "editor.use_custom_colors" is set to `true`.
+
−- name: editor.background_color
+
−  type: String
+
−  value: "#FFFFFF"
+
−  mirror: never
+
−
+
−# Use compatible range computation when applying inline style.  This is used
+
−# for making it possible to backout with Normandy Pref Rollout.
+
−- name: editor.inline_style.range.compatible_with_the_other_browsers
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether use Blink/WebKit compatbile joining nodes and split a node direction.
+
−# false: Left node will be created (at splitting) and deleted (at joining)
+
−# true:  Right node will be created (at splitting) and deleted (at joinining)
+
−- name: editor.join_split_direction.compatible_with_the_other_browsers
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Delay to mask last input character in password fields.
+
−# If negative value, to use platform's default behavior.
+
−# If 0, no delay to mask password.
+
−# Otherwise, password fields unmask last input character(s) during specified
+
−# time (in milliseconds).
+
−- name: editor.password.mask_delay
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# Set to true when you test mask_delay of password editor.  If this is set
+
−# to true, "MozLastInputMasked" is fired when last input characters are
+
−# masked by timeout.
+
−- name: editor.password.testing.mask_delay
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# How line breakers are treated in single line editor:
+
−# * 0: Only remove the leading and trailing newlines.
+
−# * 1: Remove the first newline and all characters following it.
+
−# * 2: Replace newlines with spaces (default of Firefox).
+
−# * 3: Remove newlines from the string.
+
−# * 4: Replace newlines with commas (default of Thunderbird).
+
−# * 5: Collapse newlines and surrounding white space characters and
+
−#      remove them from the string.
+
−# Other values are treated as 1.
+
−- name: editor.singleLine.pasteNewlines
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether user pastes should be truncated.
+
−- name: editor.truncate_user_pastes
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this is set to `true`, "editor.background_color" must be set, then,
+
−# the value is treated as default background color of the HTML editor.
+
−# If `false` and "browser.display.use_system_colors" is set to `true`,
+
−# "browser.display.background_color" is used instead.
+
−# Otherwise, no color is used as default background color.
+
−# This pref is for Thunderbird and SeaMonkey.
+
−- name: editor.use_custom_colors
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If this is set to `true`, CSS mode of style editor is enabled by default
+
−# unless it's a mail editor.
+
−# This pref is for Thunderbird and SeaMonkey.
+
−- name: editor.use_css
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether enabling blink compatible white-space normalizer or keep using
+
−# Gecko's traditional white-space normalizer.
+
−- name: editor.white_space_normalization.blink_compatible
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# General prefs for editor, indicating whether Gecko-specific editing UI is
+
−# enabled by default. Those UIs are not implemented by any other browsers.  So,
+
−# only Firefox users can change some styles with them. This means that Firefox
+
−# users may get unexpected result of some web apps if they assume that users
+
−# cannot change such styles.
+
−- name: editor.resizing.enabled_by_default
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−- name: editor.inline_table_editing.enabled_by_default
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−- name: editor.positioning.enabled_by_default
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Controls if a double click word selection also deletes one adjacent whitespace
+
−# (if feasible). This mimics native behaviour on MacOS.
+
−- name: editor.word_select.delete_space_after_doubleclick_selection
+
−  type: bool
+
−#ifdef XP_MACOSX
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "extensions."
+
−#---------------------------------------------------------------------------
+
−
+
−# Pref that enforces the use of web_accessible_resources for content loads.
+
−# This behavior is default for MV3.  The pref controls this for MV2.
+
−- name: extensions.content_web_accessible.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the InstallTrigger implementation should be enabled (or hidden and
+
−# none of its methods available).
+
−- name: extensions.InstallTriggerImpl.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the InstallTrigger implementation should be enabled (or completely
+
−# hidden), separate from InstallTriggerImpl because InstallTrigger is improperly
+
−# used also for UA detection.
+
−- name: extensions.InstallTrigger.enabled
+
−  type: bool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−
+
−# Whether the background.service_worker in the extension manifest.json file
+
−# is enabled.
+
−- name: extensions.backgroundServiceWorker.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Maximum number of misspelled words in a text.
+
−- name: extensions.spellcheck.inline.max-misspellings
+
−  type: int32_t
+
−  value: 500
+
−  mirror: always
+
−
+
−# Whether the extensions can register a service worker on its own.
+
−# NOTE: WebExtensions Framework ability to register a background service worker
+
−# is not controlled by this pref, only the extension code ability to use
+
−# navigator.serviceWorker.register is locked behind this pref.
+
−- name: extensions.serviceWorkerRegister.allowed
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Legacy behavior on filterResponse calls on intercepted sw script requests.
+
−- name: extensions.filterResponseServiceWorkerScript.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref governs whether we run webextensions in a separate process (true)
+
−# or the parent/main process (false)
+
−- name: extensions.webextensions.remote
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to expose the MockExtensionAPI test interface in tests.
+
−# The interface MockExtensionAPI doesn't represent a real extension API,
+
−# it is only available in test and does include a series of cases useful
+
−# to test the API request handling without tying the unit test to a
+
−# specific WebExtensions API.
+
−- name: extensions.webidl-api.expose_mock_interface
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to allow acccess to AddonManager to developer sites for testing
+
−# NOTE: We'd like this to be a "hidden" pref once StaticPrefs supports it.
+
−- name: extensions.webapi.testing
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Automation-only pref to allow AddonManager over insecure protocols.
+
−# NOTE: We'd like this to be a "hidden" pref once StaticPrefs supports it.
+
−- name: extensions.webapi.testing.http
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "fission."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether to enable Fission in new windows by default.
+
−# IMPORTANT: This preference should *never* be checked directly, since any
+
−# session can contain a mix of Fission and non-Fission windows. Instead,
+
−# callers should check whether the relevant nsILoadContext has the
+
−# `useRemoteSubframes` flag set.
+
−# Callers which cannot use `useRemoteSubframes` must use
+
−# `Services.appinfo.fissionAutostart` or `mozilla::FissionAutostart()` to check
+
−# whether fission is enabled by default.
+
−- name: fission.autostart
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: never
+
−
+
−# This pref has no effect within fission windows, it only controls the
+
−# behaviour within non-fission windows. If true, preserve browsing contexts
+
−# between process swaps.
+
−- name: fission.preserve_browsing_contexts
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disable storing the session history in the parent process, and accessing it
+
−# over IPC from the child processes.
+
−- name: fission.disableSessionHistoryInParent
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−# If session history is stored in the parent process, enable bfcache for it.
+
−- name: fission.bfcacheInParent
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Allow renaming of processes from Private Windows to the eTLD+1 on nightly
+
−# Setting this pref creates a privacy leak, but helps greatly with
+
−# debugging.
+
−- name: fission.processPrivateWindowSiteNames
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allow renaming of process names to the eTLD+1 on all versions, NOT
+
−# including processes from Private Windows
+
−# Setting this pref creates a privacy leak, but helps greatly with
+
−# debugging
+
−- name: fission.processSiteNames
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allow showing of current profile along with process names, NOT
+
−# including processes from Private Windows
+
−# Setting this pref creates a privacy leak, but helps greatly with
+
−# debugging
+
−- name: fission.processProfileName
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, allow process-switching documents loaded by <object> and <embed>
+
−# elements into a remote process.
+
−# NOTE: This pref has no impact outside of windows with the
+
−# `useRemoteSubframes` flag set.
+
−- name: fission.remoteObjectEmbed
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The strategy used to control how sites are isolated into separate processes
+
−# when Fisison is enabled. This pref has no effect if Fission is disabled.
+
−# See the `WebContentIsolationStrategy` enum in `ProcessIsolation.cpp`.
+
−- name: fission.webContentIsolationStrategy
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Time in seconds before a site loaded with the Cross-Origin-Opener-Policy
+
−# header is no longer considered high-value and isolated in the "highValueCOOP"
+
−# configuration.
+
−- name: fission.highValue.coop.expiration
+
−  type: uint32_t
+
−  value: 2592000   # 30 days (in seconds)
+
−  mirror: always
+
−
+
−# Time in seconds before a site are considered high-value by the login detection
+
−# service is no longer considered high-value and isolated in the "highValueHasSavedLogin"
+
−# or "highValueIsLoggedIn" configuration.
+
−- name: fission.highValue.login.expiration
+
−  type: uint32_t
+
−  value: 2592000   # 30 days (in seconds)
+
−  mirror: always
+
−
+
−# If true, capture login attemp, and add "highValueIsLoggedIn" permission to
+
−# the permission manager no matter whether fission is enabled and
+
−# WebContentIsolationStrateg is set to IsolateHighvalue.
+
−- name: fission.highValue.login.monitor
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# If true, do not send blocklisted preference values to the subprocess
+
−- name: fission.omitBlocklistedPrefsInSubprocesses
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If true, crash when a blocklisted preference is accessed in a subprocess
+
−- name: fission.enforceBlocklistedPrefsInSubprocesses
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "font."
+
−#---------------------------------------------------------------------------
+
−
+
−# A value greater than zero enables font size inflation for
+
−# pan-and-zoom UIs, so that the fonts in a block are at least the size
+
−# that, if a block's width is scaled to match the device's width, the
+
−# fonts in the block are big enough that at most the pref value ems of
+
−# text fit in *the width of the device*.
+
−#
+
−# When both this pref and the next are set, the larger inflation is used.
+
−- name: font.size.inflation.emPerLine
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# A value greater than zero enables font size inflation for
+
−# pan-and-zoom UIs, so that if a block's width is scaled to match the
+
−# device's width, the fonts in a block are at least the given font size.
+
−# The value given is in twips, i.e., 1/20 of a point, or 1/1440 of an inch.
+
−#
+
−# When both this pref and the previous are set, the larger inflation is used.
+
−- name: font.size.inflation.minTwips
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# In products with multi-mode pan-and-zoom and non-pan-and-zoom UIs,
+
−# this pref forces font inflation to always be enabled in all modes.
+
−# That is, any heuristics used to detect pan-and-zoom
+
−# vs. non-pan-and-zoom modes are disabled and all content is treated
+
−# as pan-and-zoom mode wrt font inflation.
+
−#
+
−# This pref has no effect if font inflation is not enabled through
+
−# either of the prefs above.  It has no meaning in single-mode UIs.
+
−- name: font.size.inflation.forceEnabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# In products with multi-mode pan-and-zoom and non-pan-and-zoom UIs,
+
−# this pref disables font inflation in master-process contexts where
+
−# existing heuristics can't be used determine enabled-ness.
+
−#
+
−# This pref has no effect if font inflation is not enabled through
+
−# either of the prefs above.  The "forceEnabled" pref above overrides
+
−# this pref.
+
−- name: font.size.inflation.disabledInMasterProcess
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Defines the font size inflation mapping intercept parameter.
+
−#
+
−# Font size inflation computes a minimum font size, m, based on
+
−# other preferences (see font.size.inflation.minTwips and
+
−# font.size.inflation.emPerLine, above) and the width of the
+
−# frame in which the text resides. Using this minimum, a specified
+
−# font size, s, is mapped to an inflated font size, i, using an
+
−# equation that varies depending on the value of the font size
+
−# inflation mapping intercept parameter, P.
+
−#
+
−# If the intercept parameter is negative, then the following mapping
+
−# function is used:
+
−#
+
−# i = m + s
+
−#
+
−# If the intercept parameter is non-negative, then the mapping function
+
−# is a function such that its graph meets the graph of i = s at the
+
−# point where both i and s are (1 + P/2) * m for values of s that are
+
−# large enough. This means that when s=0, i is always equal to m.
+
−- name: font.size.inflation.mappingIntercept
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Since the goal of font size inflation is to avoid having to
+
−# repeatedly scroll side to side to read a block of text, and there are
+
−# a number of page layouts where a relatively small chunk of text is
+
−# better off not being inflated according to the same algorithm we use
+
−# for larger chunks of text, we want a threshold for an amount of text
+
−# that triggers font size inflation.  This preference controls that
+
−# threshold.
+
−#
+
−# It controls the threshold used within an *approximation* of the
+
−# number of lines of text we use.  In particular, if we assume that
+
−# each character (collapsing collapsible whitespace) has a width the
+
−# same as the em-size of the font (when, normally, it's actually quite
+
−# a bit smaller on average), this preference gives the percentage of a
+
−# number of lines of text we'd need to trigger inflation.  This means
+
−# that a percentage of 100 means that we'd need a number of characters
+
−# (we know the font size and the width) equivalent to one line of
+
−# square text (which is actually a lot less than a real line of text).
+
−#
+
−# A value of 0 means there's no character length threshold.
+
−- name: font.size.inflation.lineThreshold
+
−  type: uint32_t
+
−  value: 400
+
−  mirror: always
+
−
+
−# This controls the percentage that fonts will be inflated, if font
+
−# size inflation is enabled. Essentially, if we have a specified font
+
−# size, s, and an inflated font size, i, this specifies that the ratio
+
−# i/s * 100 should never exceed the value of this preference. In order
+
−# for this preference to have any effect, its value must be greater
+
−# than 100, since font inflation can never decrease the ratio i/s.
+
−- name: font.size.inflation.maxRatio
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "full-screen-api."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: full-screen-api.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: full-screen-api.allow-trusted-requests-only
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: full-screen-api.mouse-event-allow-left-button-only
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: full-screen-api.exit-on.windowOpen
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: full-screen-api.exit-on.windowRaise
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: full-screen-api.pointer-lock.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# whether to prevent the top level widget from going fullscreen
+
−- name: full-screen-api.ignore-widgets
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "fuzzing.". It's important that these can only be
+
−# checked in fuzzing builds (when FUZZING is defined), otherwise you could
+
−# enable the fuzzing stuff on your regular build which would be bad :)
+
−#---------------------------------------------------------------------------
+
−
+
−#ifdef FUZZING
+
−-   name: fuzzing.enabled
+
−    type: bool
+
−#ifdef FUZZING_SNAPSHOT
+
−    value: true
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−
+
−-   name: fuzzing.necko.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: fuzzing.necko.http3
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−    rust: true
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "general."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: general.aboutConfig.enable
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Limits the depth of recursive conversion of data when opening
+
−# a content to view.  This is mostly intended to prevent infinite
+
−# loops with faulty converters involved.
+
−- name: general.document_open_conversion_depth_limit
+
−  type: uint32_t
+
−  value: 20
+
−  mirror: always
+
−
+
−- name: general.smoothScroll
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# This pref and general.smoothScroll.stopDecelerationWeighting determine
+
−# the timing function.
+
−- name: general.smoothScroll.currentVelocityWeighting
+
−  type: AtomicFloat
+
−  value: 0.25
+
−  mirror: always
+
−
+
−# To connect consecutive scroll events into a continuous flow, the animation's
+
−# duration should be longer than scroll events intervals (or else the scroll
+
−# will stop before the next event arrives - we're guessing the next interval
+
−# by averaging recent intervals).
+
−# This defines how much longer the duration is compared to the events
+
−# interval (percentage).
+
−- name: general.smoothScroll.durationToIntervalRatio
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.lines
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.lines.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.lines.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.mouseWheel
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.mouseWheel.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.mouseWheel.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 50
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.other
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.other.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.other.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pages
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pages.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pages.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.scrollbars
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.scrollbars.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.scrollbars.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pixels
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pixels.durationMaxMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.pixels.durationMinMS
+
−  type: RelaxedAtomicInt32
+
−  value: 150
+
−  mirror: always
+
−
+
−# This pref and general.smoothScroll.currentVelocityWeighting determine
+
−# the timing function.
+
−- name: general.smoothScroll.stopDecelerationWeighting
+
−  type: AtomicFloat
+
−  value: 0.4f
+
−  mirror: always
+
−
+
−# Alternative smooth scroll physics. ("MSD" = Mass-Spring-Damper)
+
−- name: general.smoothScroll.msdPhysics.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.continuousMotionMaxDeltaMS
+
−  type: RelaxedAtomicInt32
+
−  value: 120
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.motionBeginSpringConstant
+
−  type: RelaxedAtomicInt32
+
−  value: 1250
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.slowdownMinDeltaMS
+
−  type: RelaxedAtomicInt32
+
−  value: 12
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.slowdownMinDeltaRatio
+
−  type: AtomicFloat
+
−  value: 1.3f
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.slowdownSpringConstant
+
−  type: RelaxedAtomicInt32
+
−  value: 2000
+
−  mirror: always
+
−
+
−- name: general.smoothScroll.msdPhysics.regularSpringConstant
+
−  type: RelaxedAtomicInt32
+
−  value: 1000
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "geo."
+
−#---------------------------------------------------------------------------
+
−
+
−# Is support for Navigator.geolocation enabled?
+
−- name: geo.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Time, in milliseconds, to wait for the location provider to spin up.
+
−- name: geo.timeout
+
−  type: int32_t
+
−  value: 6000
+
−  mirror: always
+
−
+
−#ifdef MOZ_ENABLE_DBUS
+
−# Whether to use Geoclue location provider (if available on the system).
+
−- name: geo.provider.use_geoclue
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to always provide high location accuracy, even if site
+
−# doesn't actually request this level of accuracy.
+
−# Almost no site correctly requests high accuracy so force it by default
+
−# for compatibility with other geolocation providers.
+
−- name: geo.provider.geoclue.always_high_accuracy
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "gfx."
+
−#---------------------------------------------------------------------------
+
−
+
−# Allow 24-bit colour when the hardware supports it.
+
−- name: gfx.android.rgb16.force
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.apitrace.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.blithelper.precision
+
−  type: RelaxedAtomicUint32
+
−  value: 2 # { 0: lowp, 1: mediump, 2: highp }
+
−  mirror: always
+
−
+
−- name: gfx.blithelper.lut-size.rgb.b
+
−  type: RelaxedAtomicUint32
+
−  value: 15
+
−  mirror: always
+
−- name: gfx.blithelper.lut-size.rgb.g
+
−  type: RelaxedAtomicUint32
+
−  value: 31
+
−  mirror: always
+
−- name: gfx.blithelper.lut-size.rgb.r
+
−  type: RelaxedAtomicUint32
+
−  value: 31
+
−  mirror: always
+
−
+
−- name: gfx.blithelper.lut-size.ycbcr.cb
+
−  type: RelaxedAtomicUint32
+
−  value: 15
+
−  mirror: always
+
−- name: gfx.blithelper.lut-size.ycbcr.cr
+
−  type: RelaxedAtomicUint32
+
−  value: 31
+
−  mirror: always
+
−- name: gfx.blithelper.lut-size.ycbcr.y
+
−  type: RelaxedAtomicUint32
+
−  value: 31
+
−  mirror: always
+
−
+
−# Nb: we ignore this pref on release and beta.
+
−- name: gfx.blocklist.all
+
−  type: int32_t
+
−  value: 0
+
−  mirror: once
+
−
+
−#if defined(XP_MACOSX)
+
−- name: gfx.cairo_quartz_cg_layer.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−- name: gfx.canvas.accelerated
+
−  type: bool
+
−#if defined(XP_MACOSX) || defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to attempt to enable Accelerated Canvas2D regardless of blocklisting.
+
−- name: gfx.canvas.accelerated.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.async-present
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.cache-items
+
−  type: RelaxedAtomicUint32
+
−  value: 2048
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.cache-size
+
−  type: RelaxedAtomicUint32
+
−  value: 256
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.reserve-empty-cache
+
−  type: RelaxedAtomicUint32
+
−  value: 36
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.max-draw-target-count
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.max-size
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.min-size
+
−  type: RelaxedAtomicInt32
+
−  value: 128
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.max-surface-size
+
−  type: RelaxedAtomicUint32
+
−  value: 5280
+
−  mirror: always
+
−
+
−- name: gfx.canvas.accelerated.shared-page-size
+
−  type: RelaxedAtomicUint32
+
−  value: 1024
+
−  mirror: always
+
−
+
−# The minimum number of frames before acting on performance profile info
+
−- name: gfx.canvas.accelerated.profile-frames
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# The ratio of failed frames to total frames when to fall back from acceleration
+
−- name: gfx.canvas.accelerated.profile-fallback-ratio
+
−  type: AtomicFloat
+
−  value: 0.3
+
−  mirror: always
+
−
+
−# The ratio of cache misses at which to fail a profile frame
+
−- name: gfx.canvas.accelerated.profile-cache-miss-ratio
+
−  type: AtomicFloat
+
−  value: 0.66
+
−  mirror: always
+
−
+
−# The maximum size of the GPU path cache in MB.
+
−- name: gfx.canvas.accelerated.gpu-path-size
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−# The maximum allowed complexity of a GPU path.
+
−- name: gfx.canvas.accelerated.gpu-path-complexity
+
−  type: RelaxedAtomicUint32
+
−  value: 4000
+
−  mirror: always
+
−
+
−# Whether to accelerate stroked paths by converting them to fill paths.
+
−- name: gfx.canvas.accelerated.stroke-to-fill-path
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to use aa-stroke to accelerate stroked paths.
+
−- name: gfx.canvas.accelerated.aa-stroke.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Draws an indicator if acceleration is used.
+
−- name: gfx.canvas.accelerated.debug
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# 0x7fff is the maximum supported xlib surface size and is more than enough for canvases.
+
−- name: gfx.canvas.max-size
+
−  type: RelaxedAtomicInt32
+
−  value: 0x7fff
+
−  mirror: always
+
−
+
−- name: gfx.canvas.remote
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: gfx.color_management.display_profile
+
−  type: DataMutexString
+
−  value: ""
+
−  mirror: always # But be warned: We cache the result.
+
−
+
−- name: gfx.color_management.force_srgb
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.color_management.native_srgb
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: gfx.color_management.enablev4
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# 0 = Off, 1 = Full, 2 = Tagged Images Only.
+
−# See CMSMode in gfx/thebes/gfxPlatform.h.
+
−- name: gfx.color_management.mode
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−
+
−# The zero default here should match QCMS_INTENT_DEFAULT from qcms.h
+
−- name: gfx.color_management.rendering_intent
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: gfx.color_management.rec709_gamma_as_srgb
+
−  type: RelaxedAtomicBool
+
−  value: true # Tragic backwards compat.
+
−  mirror: always
+
−
+
−- name: gfx.color_management.rec2020_gamma_as_rec709
+
−  type: RelaxedAtomicBool
+
−  value: true # Match naive behavior, but hopefully we can stop soon!
+
−  mirror: always
+
−
+
−- name: gfx.compositor.clearstate
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether GL contexts can be migrated to a different GPU (to match the one the
+
−# OS is using for composition).
+
−#
+
−# 0 = force disable migration
+
−# 1 = use migration where in safe configurations (the default)
+
−# 2 = force enable migration (for testing)
+
−- name: gfx.compositor.gpu-migration
+
−  type: RelaxedAtomicInt32
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: gfx.core-animation.tint-opaque
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef XP_MACOSX
+
−  # Create specialized video-only layers for video content in
+
−  # fullscreen windows. Consistently works well on Apple Silicon,
+
−  # some issues remain on Intel hardware.
+
−-   name: gfx.core-animation.specialize-video
+
−    type: RelaxedAtomicBool
+
−#if defined(MOZ_AARCH64)
+
−    value: true
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−#endif
+
−
+
−#if defined(XP_MACOSX) && defined(NIGHTLY_BUILD)
+
−  # Spoof the timing of the video sample instead of marking the untimed
+
−  # sample to be displayed immediately.
+
−-   name: gfx.core-animation.specialize-video.spoof-timing
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Check that the sample has a color space and if it doesn't, log that
+
−  # and supply the default color space from the main display.
+
−-   name: gfx.core-animation.specialize-video.check-color-space
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Log properties of the video surface, buffer, and format.
+
−-   name: gfx.core-animation.specialize-video.log
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−#ifdef XP_MACOSX
+
−-   name: gfx.core-animation.low-power-telemetry-frames
+
−    type: int32_t
+
−    value: 600
+
−    mirror: once
+
−#endif
+
−
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  # Overrides the glClear color used when the surface origin is not (0, 0)
+
−  # Used for drawing a border around the content.
+
−-   name: gfx.compositor.override.clear-color.r
+
−    type: AtomicFloat
+
−    value: 0.0f
+
−    mirror: always
+
−
+
−-   name: gfx.compositor.override.clear-color.g
+
−    type: AtomicFloat
+
−    value: 0.0f
+
−    mirror: always
+
−
+
−-   name: gfx.compositor.override.clear-color.b
+
−    type: AtomicFloat
+
−    value: 0.0f
+
−    mirror: always
+
−
+
−-   name: gfx.compositor.override.clear-color.a
+
−    type: AtomicFloat
+
−    value: 0.0f
+
−    mirror: always
+
−#endif  # defined(MOZ_WIDGET_ANDROID)
+
−
+
−- name: gfx.content.always-paint
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Size in megabytes
+
−- name: gfx.content.skia-font-cache-size
+
−  type: int32_t
+
−  value: 5
+
−  mirror: once
+
−
+
−- name: gfx.device-reset.limit
+
−  type: int32_t
+
−  value: 10
+
−  mirror: once
+
−
+
−- name: gfx.device-reset.threshold-ms
+
−  type: int32_t
+
−  value: -1
+
−  mirror: once
+
−
+
−
+
−# Whether to disable the automatic detection and use of direct2d.
+
−- name: gfx.direct2d.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether to attempt to enable Direct2D regardless of automatic detection or
+
−# blacklisting.
+
−- name: gfx.direct2d.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.direct2d.target-independent-rasterization.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.direct3d11.reuse-decoder-device
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−# Enable reuse decoder device even when it is blocked.
+
−- name: gfx.direct3d11.reuse-decoder-device-force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.direct3d11.allow-keyed-mutex
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.direct3d11.use-double-buffering
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.direct3d11.enable-debug-layer
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.direct3d11.break-on-error
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.direct3d11.sleep-on-create-device
+
−  type: int32_t
+
−  value: 0
+
−  mirror: once
+
−
+
−# Rate by which the frame rate is divided. I.e. at a number higher than 1 we
+
−# will only refresh every <x> frames.
+
−- name: gfx.display.frame-rate-divisor
+
−  type: RelaxedAtomicInt32
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: gfx.display.max-frame-rate
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Whether to preserve color bitmap tables in fonts (bypassing OTS).
+
−# Currently these are supported only on platforms where we use Freetype
+
−# to render fonts (Linux/Gtk and Android).
+
−- name: gfx.downloadable_fonts.keep_color_bitmaps
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether font sanitization is performed on the main thread or not.
+
−- name: gfx.downloadable_fonts.sanitize_omt
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to validate OpenType variation tables in fonts.
+
−- name: gfx.downloadable_fonts.validate_variation_tables
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether OTS validation should be applied to OpenType Layout (OTL) tables.
+
−- name: gfx.downloadable_fonts.otl_validation
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: always
+
−
+
−- name: gfx.e10s.font-list.shared
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Do we fire a notification about missing fonts, so the front-end can decide
+
−# whether to try and do something about it (e.g. download additional fonts)?
+
−- name: gfx.missing_fonts.notify
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#if !defined(MOZ_WIDGET_ANDROID)
+
−- name: gfx.egl.prefer-gles.enabled
+
−  type: bool
+
−#if defined(MOZ_WIDGET_GTK) && defined(MOZ_AARCH64)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−#endif
+
−
+
−# [Windows] Whether registry FontSubstitutes entries are used unconditionally,
+
−# or only if the original font is not available.
+
−#if defined(XP_WIN)
+
−- name: gfx.windows-font-substitutes.always
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−- name: gfx.font-list-omt.enabled
+
−  type: bool
+
−#if defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−# [Android] OPPO, realme and OnePlus device seem to crash when using Font
+
−# Match API. We turn off this feature on these devices. Set true if you want to
+
−# turn on it at force.
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−- name: gfx.font-list.use_font_match_api.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−# Whether to load fonts (e.g. Twemoji Mozilla) bundled with the application:
+
−#  -1 - Auto behavior based on OS version (currently, disables loading on
+
−#       "low-memory" Android devices)
+
−#   0 - Skip loading any bundled fonts
+
−#   1 - Always load bundled fonts
+
−- name: gfx.bundled-fonts.activate
+
−  type: int32_t
+
−  value: -1
+
−  mirror: once
+
−
+
−- name: gfx.font_loader.delay
+
−  type: uint32_t
+
−#if defined(XP_WIN)
+
−  value: 60000
+
−#else
+
−  value: 8000
+
−#endif
+
−  mirror: once
+
−
+
−# Disable antialiasing of Ahem, for use in tests.
+
−- name: gfx.font_rendering.ahem_antialias_none
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#if defined(XP_MACOSX)
+
−  # Set to true to revert from HarfBuzz AAT shaping to the old Core Text
+
−  # backend.
+
−-   name: gfx.font_rendering.coretext.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−- name: gfx.font_rendering.colr_v1.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.font_rendering.opentype_svg.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−- name: gfx.font_rendering.fallback.async
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# whether to always search all font cmaps during system font fallback
+
−- name: gfx.font_rendering.fallback.always_use_cmaps
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−-   name: gfx.font_rendering.fontconfig.max_generic_substitutions
+
−    type: RelaxedAtomicUint32
+
−    value: 3
+
−    mirror: always
+
−#endif
+
−
+
−#if defined(XP_WIN)
+
−# Whether the DirectWrite bold simulation should be used when a bold font-weight
+
−# is requested but no bold face available in the family. This renders poorly with
+
−# some third-party fonts, so by default we disable it for webfonts and allow it
+
−# only with locally-installed fonts.
+
−# Values:
+
−#   0 - never use DWrite bold simulation; always multi-strike instead
+
−#   1 - use DWrite bold for installed fonts, multi-strike for webfont resources
+
−#   2 - use DWrite bold for all fonts
+
−- name: gfx.font_rendering.directwrite.bold_simulation
+
−  type: RelaxedAtomicUint32
+
−  value: 1
+
−  mirror: always
+
−#endif
+
−
+
−- name: gfx.font_rendering.graphite.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Cache shaped word results
+
−- name: gfx.font_rendering.wordcache.charlimit
+
−  type: RelaxedAtomicUint32
+
−  value: 32
+
−  mirror: always
+
−
+
−# Cache shaped word results
+
−- name: gfx.font_rendering.wordcache.maxentries
+
−  type: RelaxedAtomicUint32
+
−  value: 10000
+
−  mirror: always
+
−
+
−# The level of logging:
+
−# - 0: no logging;
+
−# - 1: adds errors;
+
−# - 2: adds warnings;
+
−# - 3 or 4: adds debug logging.
+
−# If you set the value to 4, you will also need to set the environment
+
−# variable MOZ_LOG to gfx:4. See mozilla/Logging.h for details.
+
−- name: gfx.logging.level
+
−  type: RelaxedAtomicInt32
+
−  value: mozilla::gfx::LOG_DEFAULT
+
−  mirror: always
+
−  include: mozilla/gfx/LoggingConstants.h
+
−
+
−- name: gfx.logging.crash.length
+
−  type: uint32_t
+
−  value: 16
+
−  mirror: once
+
−
+
−# The maximums here are quite conservative, we can tighten them if problems show up.
+
−- name: gfx.logging.texture-usage.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.logging.peak-texture-usage.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.logging.slow-frames.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Use gfxPlatform::MaxAllocSize instead of the pref directly.
+
−- name: gfx.max-alloc-size
+
−  type: int32_t
+
−  value: (int32_t)0x7FFFFFFF
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−# Use gfxPlatform::MaxTextureSize instead of the pref directly.
+
−- name: gfx.max-texture-size
+
−  type: int32_t
+
−  value: (int32_t)32767
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−# Enable OffscreenCanvas everywhere.
+
−- name: gfx.offscreencanvas.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.omta.background-color
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.partialpresent.force
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# SwapInterval
+
−- name: gfx.swap-interval.glx
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.swap-interval.egl
+
−  type: RelaxedAtomicBool
+
−  mirror: always
+
−#ifdef MOZ_WIDGET_ANDROID
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−
+
−
+
−# Log severe performance warnings to the error console and profiles.
+
−# This should be use to quickly find which slow paths are used by test cases.
+
−- name: gfx.perf-warnings.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_X11
+
−# Whether to force using GLX over EGL.
+
−- name: gfx.x11-egl.force-disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether to force using EGL over GLX.
+
−- name: gfx.x11-egl.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.x11.glx_sgi_video_sync
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−- name: gfx.testing.device-fail
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.testing.device-reset
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: gfx.text.disable-aa
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.text.subpixel-position.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.text.subpixel-position.force-disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.use-iosurface-textures
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.use-mutex-on-present
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Use SurfaceTextures as preferred backend for TextureClient/Host.
+
−- name: gfx.use-surfacetexture-textures
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.vsync.compositor.unobserve-count
+
−  type: int32_t
+
−  value: 10
+
−  mirror: once
+
−
+
−- name: gfx.vsync.force-disable-waitforvblank
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.will-change.ignore-opacity
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Should we override the blocklist to enable WebGPU?
+
−- name: gfx.webgpu.ignore-blocklist
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether to use the WebRender hardware backend
+
−- name: gfx.webrender.all
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−#ifdef XP_WIN
+
−- name: gfx.webrender.force-angle
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−#endif
+
−
+
−# WebRender is not enabled when there is no GPU process on window when
+
−# WebRender uses ANGLE. It is for avoiding that WebGL and WebRender use ANGLE
+
−# at once. But there is a case that we want to enable WebRender for testing.
+
−#ifdef XP_WIN
+
−- name: gfx.webrender.enabled-no-gpu-process-with-angle-win
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−#endif
+
−
+
−- name: gfx.webrender.blob-images
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.webrender.svg-images
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.webrender.svg-shapes
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gfx.webrender.debug.blob.paint-flashing
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.webrender.debug.enable-capture
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.webrender.debug.dl.dump-parent
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.webrender.debug.dl.dump-content
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.webrender.debug.dl.dump-content-serialized
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−- name: gfx.webrender.reject-software-driver
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−#endif
+
−
+
−- name: gfx.webrender.debug.highlight-painted-layers
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.webrender.late-scenebuild-threshold
+
−  type: RelaxedAtomicInt32
+
−  value: 4
+
−  mirror: always
+
−
+
−- name: gfx.webrender.max-filter-ops-per-chain
+
−  type: RelaxedAtomicUint32
+
−  value: 64
+
−  mirror: always
+
−
+
−- name: gfx.webrender.batching.lookback
+
−  type: uint32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−- name: gfx.webrender.blob-tile-size
+
−  type: uint32_t
+
−  value: 256
+
−  mirror: always
+
−
+
−- name: gfx.webrender.batched-upload-threshold
+
−  type: int32_t
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: 262144
+
−#else
+
−  value: 65536
+
−#endif
+
−  mirror: always
+
−
+
−- name: gfx.webrender.compositor
+
−  type: bool
+
−#if defined(XP_WIN) || defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: gfx.webrender.scissored-cache-clears.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: gfx.webrender.scissored-cache-clears.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.webrender.compositor.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.webrender.compositor.max_update_rects
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: once
+
−
+
−- name: gfx.webrender.compositor.surface-pool-size
+
−  type: uint32_t
+
−  value: 25
+
−  mirror: once
+
−
+
−# Number of damage rects we can give to the compositor for a new frame with
+
−# partial present. This controls whether partial present is used or not.
+
−- name: gfx.webrender.max-partial-present-rects
+
−  type: uint32_t
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GTK)
+
−  value: 1
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: once
+
−
+
−# Whether or not we can reuse the buffer contents using the GL buffer age
+
−# extension, if supported by the platform. This requires partial present
+
−# to be used.
+
−- name: gfx.webrender.allow-partial-present-buffer-age
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether or not we should force partial present on.
+
−- name: gfx.webrender.force-partial-present
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.webrender.enable-gpu-markers
+
−  type: bool
+
−#ifdef DEBUG
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: gfx.webrender.enable-item-cache
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether or not to fallback from WebRender to Software WebRender.
+
−- name: gfx.webrender.fallback.software
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−#ifdef XP_WIN
+
−  # Whether to use an overlay of hardware decoded video with DirectComposition
+
−-   name: gfx.webrender.dcomp-video-hw-overlay-win
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−  # Enable hardware decoded video overlay even when it is blocked.
+
−-   name: gfx.webrender.dcomp-video-hw-overlay-win-force-enabled
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−  # Whether to use a yuv video overlay layers with DirectComposition
+
−-   name: gfx.webrender.dcomp-video-yuv-overlay-win
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−-   name: gfx.webrender.dcomp-video-vp-scaling-win
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−  # Whether to use virtual surfaces, as opposed to each tile owning a surface.
+
−-   name: gfx.webrender.dcomp-use-virtual-surfaces
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−  # Whether to use an overlay of software decoded video with DirectComposition
+
−-   name: gfx.webrender.dcomp-video-sw-overlay-win
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−  # Enable software decoded video overlay even when it is blocked.
+
−-   name: gfx.webrender.dcomp-video-sw-overlay-win-force-enabled
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−-   name: gfx.webrender.dcomp-video-check-slow-present
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−  # Force triple buffering in overlay's video swap chain
+
−-   name: gfx.webrender.dcomp-video-force-triple-buffering
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−-   name: gfx.video.convert-i420-to-nv12.force-enabled
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−#endif
+
−
+
−# Whether or not fallback to Software WebRender requires the GPU process.
+
−- name: gfx.webrender.fallback.software.requires-gpu-process
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: gfx.webrender.program-binary-disk
+
−  type: bool
+
−#if defined(XP_WIN) || defined(ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: gfx.webrender.use-optimized-shaders
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: gfx.webrender.precache-shaders
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# When gl debug message is a high severity message, forwward it to gfx critical
+
−# note.
+
−- name: gfx.webrender.gl-debug-message-critical-note
+
−  type: bool
+
−#if defined(XP_WIN) && defined(NIGHTLY_BUILD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−# Enable printing gl debug messages
+
−- name: gfx.webrender.gl-debug-message-print
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−#ifdef NIGHTLY_BUILD
+
−  # Keep this pref hidden on non-nightly builds to avoid people accidentally
+
−  # turning it on.
+
−- name: gfx.webrender.panic-on-gl-error
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−#ifdef XP_WIN
+
−  # Enables display of performance debugging counters when DirectComposition
+
−  # is used.
+
−  # Performance counters are displayed on the top-right corner of the screen.
+
−-   name: gfx.webrender.debug.dcomp-counter
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−  # Enables highlighting redraw regions of DCompositionVisual
+
−-   name: gfx.webrender.debug.dcomp-redraw-regions
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−#ifdef XP_MACOSX
+
−  # Files show up in $HOME/Desktop/nativelayerdumps-PID/frame-123.html
+
−-   name: gfx.webrender.debug.dump-native-layer-tree-to-file
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−- name: gfx.webrender.enable-low-priority-pool
+
−  type: RelaxedAtomicBool
+
−#if defined(ANDROID)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−  # Force subpixel anti-aliasing as much as possible, despite performance cost.
+
−- name: gfx.webrender.quality.force-subpixel-aa-where-possible
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gfx.webrender.enable-subpixel-aa
+
−  type: bool
+
−  mirror: once
+
−#ifdef MOZ_WIDGET_ANDROID
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−
+
−#ifdef XP_MACOSX
+
−- name: gfx.webrender.enable-client-storage
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−#endif
+
−
+
− # Width of WebRender tile size
+
−- name: gfx.webrender.picture-tile-width
+
−  type: RelaxedAtomicInt32
+
−  value: 1024
+
−  mirror: always
+
−
+
− # Width of WebRender tile size
+
−- name: gfx.webrender.picture-tile-height
+
−  type: RelaxedAtomicInt32
+
−  value: 512
+
−  mirror: always
+
−
+
−# WebRender upper bound for shared surface size
+
−# According to apitrace, textures larger than 2048 break fast clear
+
−# optimizations on some intel drivers. We sometimes need to go larger, but
+
−# we try to avoid it.
+
−- name: gfx.webrender.max-shared-surface-size
+
−  type: int32_t
+
−  value: 2048
+
−  mirror: once
+
−
+
−# Whether to use EGL robustness or not.
+
−- name: gfx.webrender.prefer-robustness
+
−  type: bool
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−# Whether to use the WebRender software backend
+
−- name: gfx.webrender.software
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether to use the D3D11 RenderCompositor when using WebRender software backend
+
−- name: gfx.webrender.software.d3d11
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: gfx.webrender.software.opengl
+
−  type: bool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: gfx.webrender.software.d3d11.upload-mode
+
−  type: RelaxedAtomicInt32
+
−  value: 4
+
−  mirror: always
+
−
+
−# Whether to force widgets to don't support acceleration to use WebRender
+
−# despite that
+
−- name: gfx.webrender.unaccelerated-widget.force
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable a lower quality, but higher performance pinch-zoom mode. Primarily
+
−# for devices with weak GPUs, or when running SWGL.
+
−- name: gfx.webrender.low-quality-pinch-zoom
+
−  type: bool
+
−#if defined(MOZ_WIDGET_ANDROID) && defined(NIGHTLY_BUILD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−# Disable wait of GPU execution completion
+
−- name: gfx.webrender.wait-gpu-finished.disabled
+
−  type: bool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−# Enable NVIDIA RTX Video Super Resolution for video overlay on Windows
+
−# Note: This is also a setting in NVIDIA's driver settings, so once this is
+
−# stable, it should default to true
+
−- name: gfx.webrender.super-resolution.nvidia
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Use vsync events generated by hardware
+
−- name: gfx.work-around-driver-bugs
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: gfx.ycbcr.accurate-conversion
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "gl." (OpenGL)
+
−#---------------------------------------------------------------------------
+
−
+
−- name: gl.allow-high-power
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: gl.ignore-dx-interop2-blacklist
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: gl.use-tls-is-current
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "html5."
+
−#---------------------------------------------------------------------------
+
−
+
−# Turn HTML:inert on or off.
+
−- name: html5.inert.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Time in milliseconds between the time a network buffer is seen and the timer
+
−# firing when the timer hasn't fired previously in this parse in the
+
−# off-the-main-thread HTML5 parser.
+
−- name: html5.flushtimer.initialdelay
+
−  type: RelaxedAtomicInt32
+
−  value: 16
+
−  mirror: always
+
−
+
−# Time in milliseconds between the time a network buffer is seen and the timer
+
−# firing when the timer has already fired previously in this parse.
+
−- name: html5.flushtimer.subsequentdelay
+
−  type: RelaxedAtomicInt32
+
−  value: 16
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "idle_period."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: idle_period.min
+
−  type: uint32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−- name: idle_period.during_page_load.min
+
−  type: uint32_t
+
−  value: 12
+
−  mirror: always
+
−
+
−- name: idle_period.cross_process_scheduling
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "image."
+
−#---------------------------------------------------------------------------
+
−
+
−# The maximum size (in kB) that the aggregate frames of an animation can use
+
−# before it starts to discard already displayed frames and redecode them as
+
−# necessary.
+
−- name: image.animated.decode-on-demand.threshold-kb
+
−  type: RelaxedAtomicUint32
+
−  value: 20*1024
+
−  mirror: always
+
−
+
−# The minimum number of frames we want to have buffered ahead of an
+
−# animation's currently displayed frame.
+
−- name: image.animated.decode-on-demand.batch-size
+
−  type: RelaxedAtomicUint32
+
−  value: 6
+
−  mirror: always
+
−
+
−# Whether we should recycle already displayed frames instead of discarding
+
−# them. This saves on the allocation itself, and may be able to reuse the
+
−# contents as well. Only applies if generating full frames.
+
−- name: image.animated.decode-on-demand.recycle
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Resume an animated image from the last displayed frame rather than
+
−# advancing when out of view.
+
−- name: image.animated.resume-from-last-displayed
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Maximum number of surfaces for an image before entering "factor of 2" mode.
+
−# This in addition to the number of "native" sizes of an image. A native size
+
−# is a size for which we can decode a frame without up or downscaling. Most
+
−# images only have 1, but some (i.e. ICOs) may have multiple frames for the
+
−# same data at different sizes.
+
−- name: image.cache.factor2.threshold-surfaces
+
−  type: RelaxedAtomicInt32
+
−  value: 4
+
−  mirror: always
+
−
+
−# Maximum size of a surface in KB we are willing to produce when rasterizing
+
−# an SVG.
+
−- name: image.cache.max-rasterized-svg-threshold-kb
+
−  type: RelaxedAtomicInt32
+
−  value: 200*1024
+
−  mirror: always
+
−
+
−# The maximum size, in bytes, of the decoded images we cache.
+
−- name: image.cache.size
+
−  type: int32_t
+
−  value: 5*1024*1024
+
−  mirror: once
+
−
+
−# A weight, from 0-1000, to place on time when comparing to size.
+
−# Size is given a weight of 1000 - timeweight.
+
−- name: image.cache.timeweight
+
−  type: int32_t
+
−  value: 500
+
−  mirror: once
+
−
+
−# Decode all images automatically on load, ignoring our normal heuristics.
+
−- name: image.decode-immediately.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Decode all images synchronously
+
−- name: image.decode-sync.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we attempt to downscale images during decoding.
+
−- name: image.downscale-during-decode.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we use EXIF metadata for image density.
+
−- name: image.exif-density-correction.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether EXIF density metadata is sanity checked against PixelXDimension and PixelYDimension
+
−- name: image.exif-density-correction.sanity-check.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The threshold for inferring that changes to an <img> element's |src|
+
−# attribute by JavaScript represent an animation, in milliseconds. If the |src|
+
−# attribute is changing more frequently than this value, then we enter a
+
−# special "animation mode" which is designed to eliminate flicker. Set to 0 to
+
−# disable.
+
−- name: image.infer-src-animation.threshold-ms
+
−  type: RelaxedAtomicUint32
+
−  value: 2000
+
−  mirror: always
+
−
+
−# Whether the network request priority should be adjusted according
+
−# the layout and view frame position of each particular image.
+
−- name: image.layout_network_priority
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Chunk size for calls to the image decoders.
+
−- name: image.mem.decode_bytes_at_a_time
+
−  type: uint32_t
+
−  value: 16384
+
−  mirror: once
+
−
+
−# Discards inactive image frames and re-decodes them on demand from
+
−# compressed data.
+
−- name: image.mem.discardable
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Discards inactive image frames of _animated_ images and re-decodes them on
+
−# demand from compressed data. Has no effect if image.mem.discardable is false.
+
−- name: image.mem.animated.discardable
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Enable extra information for debugging in the image memory reports.
+
−- name: image.mem.debug-reporting
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Force unmapping of unused shared surfaces after a timeout period or when we
+
−# encounter virtual memory pressure. By default this is only enabled on 32-bit
+
−# Firefox.
+
−- name: image.mem.shared.unmap.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Minimum timeout to unmap shared surfaces since they have been last used,
+
−# in milliseconds.
+
−- name: image.mem.shared.unmap.min_expiration_ms
+
−  type: uint32_t
+
−  value: 60*1000
+
−  mirror: once
+
−
+
−# Mininum size for shared surfaces to consider unmapping, in kilobytes.
+
−- name: image.mem.shared.unmap.min_threshold_kb
+
−  type: uint32_t
+
−  value: 100
+
−  mirror: once
+
−
+
−# How much of the data in the surface cache is discarded when we get a memory
+
−# pressure notification, as a fraction. The discard factor is interpreted as a
+
−# reciprocal, so a discard factor of 1 means to discard everything in the
+
−# surface cache on memory pressure, a discard factor of 2 means to discard half
+
−# of the data, and so forth. The default should be a good balance for desktop
+
−# and laptop systems, where we never discard visible images.
+
−- name: image.mem.surfacecache.discard_factor
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: once
+
−
+
−# Maximum size for the surface cache, in kilobytes.
+
−- name: image.mem.surfacecache.max_size_kb
+
−  type: uint32_t
+
−  value: 2024 * 1024
+
−  mirror: once
+
−
+
−# Minimum timeout for expiring unused images from the surface cache, in
+
−# milliseconds. This controls how long we store cached temporary surfaces.
+
−- name: image.mem.surfacecache.min_expiration_ms
+
−  type: uint32_t
+
−  value: 60*1000
+
−  mirror: once
+
−
+
−# The surface cache's size, within the constraints of the maximum size set
+
−# above, is determined as a fraction of main memory size. The size factor is
+
−# interpreted as a reciprocal, so a size factor of 4 means to use no more than
+
−# 1/4 of main memory.  The default should be a good balance for most systems.
+
−- name: image.mem.surfacecache.size_factor
+
−  type: uint32_t
+
−  value: 4
+
−  mirror: once
+
−
+
−# Whether we record SVG images as blobs or not.
+
−- name: image.svg.blob-image
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we attempt to decode WebP images or not.
+
−- name: image.webp.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we attempt to decode AVIF images or not.
+
−- name: image.avif.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_AV1)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# How strict we are in accepting/rejecting AVIF inputs according to whether they
+
−# conform to the specification
+
−# 0 = Permissive: accept whatever we can simply, unambiguously interpret
+
−# 1 = Normal: reject violations of "shall" specification directives
+
−# 2 = Strict: reject violations of "should" specification directives
+
−- name: image.avif.compliance_strictness
+
−  type: RelaxedAtomicInt32
+
−  value: 1
+
−  mirror: always
+
−
+
−# Whether we apply container-level transforms like mirroring and rotation
+
−- name: image.avif.apply_transforms
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we use dav1d (true) or libaom (false) to decode AVIF image
+
−- name: image.avif.use-dav1d
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to allow decoding of animated AVIF sequences.
+
−- name: image.avif.sequence.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether AVIF files containing sequences should be animated even when the
+
−# major brand is set to 'avif'.
+
−- name: image.avif.sequence.animate_avif_major_branded_images
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we attempt to decode JXL images or not.
+
−- name: image.jxl.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "intl."
+
−#---------------------------------------------------------------------------
+
−
+
−#ifdef XP_WIN
+
−  # Whether making Gecko TSF-aware or only working with IMM.  TSF is a modern
+
−  # IME API set of Windows which replaces IMM APIs.  Unless you can avoid the
+
−  # problem which you see with enabling TSF, you shouldn't change this pref
+
−  # to false since IMM handler is now not maintained nor tested with latest
+
−  # Windows.  If you need to change this pref to false, please file a bug to
+
−  # <https://bugzilla.mozilla.org>.
+
−  # Restart required to apply this pref change.
+
−-   name: intl.tsf.enabled
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−
+
−  # Whether Gecko creates or does not create native caret for legacy ATOK
+
−  # (2011 - 2015).
+
−-   name: intl.tsf.hack.atok.create_native_caret
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns available composition string rect or TS_E_NOLAYOUT
+
−  # from ITextStoreACP::GetTextExt() when the specified range is same as the
+
−  # range of composition string but some character rects in it are still
+
−  # dirty if and only if ATOK is active TIP.
+
−  # Note that this is ignored if active ATOK is or older than 2016 and
+
−  # create_native_caret is true.
+
−-   name: intl.tsf.hack.atok.do_not_return_no_layout_error_of_composition_string
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko sets input scope of ATOK to "search" or never does it.
+
−  # When "search" is set to the input scope, ATOK may stop their suggestions.
+
−  # To avoid it, turn this pref on, or changing the settings in ATOK.
+
−  # Note that if you enable this pref and you use the touch keyboard for touch
+
−  # screens, you cannot access some specific features for a "search" input
+
−  # field.
+
−-   name: intl.tsf.hack.atok.search_input_scope_disabled
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT
+
−  # from ITextStoreACP::GetTextExt() when the specified range is larger than
+
−  # composition start offset if and only if Free ChangJie is active TIP.
+
−-   name: intl.tsf.hack.free_chang_jie.do_not_return_no_layout_error
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns available composition string rect or TS_E_NOLAYOUT
+
−  # from ITextStoreACP::GetTextExt() when the specified range is same as the
+
−  # range of composition string but some character rects in it are still
+
−  # dirty if and only if Japanist 10 is active TIP.
+
−-   name: intl.tsf.hack.japanist10.do_not_return_no_layout_error_of_composition_string
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns previous character rect or TS_E_NOLAYOUT from
+
−  # ITfContextView::GetTextExt() when the specified range is the first
+
−  # character of selected clause of composition string if and only if Japanese TIP
+
−  # of Microsoft is active.
+
−-   name: intl.tsf.hack.ms_japanese_ime.do_not_return_no_layout_error_at_first_char
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns previous character rect or TS_E_NOLAYOUT from
+
−  # ITfContextView::GetTextExt() when the specified range is the caret of
+
−  # composition string if and only if Japanese TIP of Microsoft is active.
+
−-   name: intl.tsf.hack.ms_japanese_ime.do_not_return_no_layout_error_at_caret
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT
+
−  # from ITfContextView::GetTextExt() when the specified range is larger than
+
−  # composition start offset if and only Simplified Chinese TIP of Microsoft
+
−  # is active.
+
−-   name: intl.tsf.hack.ms_simplified_chinese.do_not_return_no_layout_error
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Geckos hacks ITextStoreACP::QueryInsert() or not.  The method should
+
−  # return new selection after specified length text is inserted at specified
+
−  # range.  However, Microsoft Pinyin and Microsoft Wubi expect that the result
+
−  # is same as specified range.  If following prefs are true,
+
−  # ITextStoreACP::QueryInsert() returns specified range only when one of the
+
−  # TIPs is active.
+
−-   name: intl.tsf.hack.ms_simplified_chinese.query_insert_result
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko returns caret rect before composition string or TS_E_NOLAYOUT
+
−  # from ITfContextView::GetTextExt() when the specified range is larger than
+
−  # composition start offset if and only Traditional Chinese TIP of Microsoft
+
−  # is active.
+
−-   name: intl.tsf.hack.ms_traditional_chinese.do_not_return_no_layout_error
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Geckos hacks ITextStoreACP::QueryInsert() or not.  The method should
+
−  # return new selection after specified length text is inserted at specified
+
−  # range.  However, Microsoft ChangJie and Microsoft Quick expect that the
+
−  # result is same as specified range.  If following prefs are true,
+
−  # ITextStoreACP::QueryInsert() returns specified range only when one of the
+
−  # TIPs is active.
+
−-   name: intl.tsf.hack.ms_traditional_chinese.query_insert_result
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether Gecko sets input scope of the URL bar to IS_DEFAULT when black
+
−  # listed IMEs are active or does not.  If you use tablet mode mainly and you
+
−  # want to use touch keyboard for URL when you set focus to the URL bar, you
+
−  # can set this to false.  Then, you'll see, e.g., ".com" key on the keyboard.
+
−  # However, if you set this to false, such IMEs set its open state to "closed"
+
−  # when you set focus to the URL bar.  I.e., input mode is automatically
+
−  # changed to English input mode.
+
−  # Known buggy IME list:
+
−  #   - Microsoft IME for Japanese
+
−  #   - Google Japanese Input
+
−  #   - Microsoft Bopomofo
+
−  #   - Microsoft ChangJie
+
−  #   - Microsoft Phonetic
+
−  #   - Microsoft Quick
+
−  #   - Microsoft New ChangJie
+
−  #   - Microsoft New Phonetic
+
−  #   - Microsoft New Quick
+
−  #   - Microsoft Pinyin
+
−  #   - Microsoft Pinyin New Experience Input Style
+
−  #   - Microsoft Wubi
+
−  #   - Microsoft IME for Korean (except on Win7)
+
−  #   - Microsoft Old Hangul
+
−-   name: intl.ime.hack.set_input_scope_of_url_bar_to_default
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−  # On Windows 10 Build 17643 (an Insider Preview build of RS5), Microsoft
+
−  # have fixed the caller of ITextACPStore::GetTextExt() to return
+
−  # TS_E_NOLAYOUT to TIP as-is, rather than converting to E_FAIL.
+
−  # Therefore, if TIP supports asynchronous layout computation perfectly, we
+
−  # can return TS_E_NOLAYOUT and TIP waits next OnLayoutChange()
+
−  # notification.  However, some TIPs still have some bugs of asynchronous
+
−  # layout support.  We keep hacking the result of GetTextExt() like running
+
−  # on Windows 10, however, there could be unknown TIP bugs if we stop
+
−  # hacking the result.  So, user can stop checking build ID to make Gecko
+
−  # hack the result forcibly.
+
−-   name: intl.tsf.hack.allow_to_stop_hacking_on_build_17643_or_later
+
−    type: bool
+
−    value: @IS_EARLY_BETA_OR_EARLIER@
+
−    mirror: always
+
−
+
−  # If true, automatically extend selection to cluster boundaries when
+
−  # TSF/TIP requests to select from/by middle of a cluster.
+
−-   name: intl.tsf.hack.extend_setting_selection_range_to_cluster_boundaries
+
−    type: bool
+
−    value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−    mirror: always
+
−
+
−  # Whether Gecko supports IMM even if TSF is enabled.  This pref exists
+
−  # only for check TSF behavior of new versions.  Therefore, users should
+
−  # not set this to false for daily use.
+
−-   name: intl.tsf.support_imm
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−
+
−  # If true, TSF and TIP (IME) can retrieve URL of the document containing
+
−  # the focused element.  When this is set to true, Gecko exposes the spec
+
−  # of the URL.
+
−  # And Gecko exposes only "http" and "https" URLs.  E.g., "data", "blob",
+
−  # "file" URLs are never exposed.
+
−-  name: intl.tsf.expose_url.allowed
+
−   type: bool
+
−   value: true
+
−   mirror: always
+
−
+
−  # If true, TSF and TIP (IME) can retrieve URL of the document containing
+
−  # the focused element in the private browsing mode too.
+
−-  name: intl.tsf.expose_url_in_private_browsing.allowed
+
−   type: bool
+
−   value: false
+
−   mirror: always
+
−
+
−#if defined(ENABLE_TESTS)
+
−  # If true, NS_GetComplexLineBreaks compares the line breaks produced in the
+
−  # content process using the Uniscribe line breaker, with those from a
+
−  # brokered call to the parent.
+
−-   name: intl.compare_against_brokered_complex_line_breaks
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−#endif
+
−
+
−# If you use legacy Chinese IME which puts an ideographic space to composition
+
−# string as placeholder, this pref might be useful.  If this is true and when
+
−# web contents forcibly commits composition (e.g., moving focus), the
+
−# ideographic space will be ignored (i.e., commits with empty string).
+
−- name: intl.ime.remove_placeholder_character_at_commit
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−
+
−#if defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK)
+
−# Whether text input without keyboard press nor IME composition should cause a
+
−# set of composition events or not.  E.g., when you use Emoji picker on macOS,
+
−# it inserts an Emoji character directly.  If set to true, `compositionstart`,
+
−# `compositionupdate` and `compositionend` events will be fired, and the
+
−# correspnding `beforeinput` events are not cancelable.  Otherwise, if set to
+
−# false, any user input events are not exposed to web apps but only
+
−# `beforeinput` event is fired as "insert text" as a cancelable event.
+
−- name: intl.ime.use_composition_events_for_insert_text
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "javascript."
+
−#
+
−# NOTE: SpiderMonkey starts up before `mirror: once` preferences are sealed and
+
−#       we cannot use them (Bug 1698311). Instead, we use `mirror: always`
+
−#       prefs but mark as `do_not_use_directly` and `LoadStartupJSPrefs` will
+
−#       mirror them into SpiderMonkey.
+
−#---------------------------------------------------------------------------
+
−
+
−# The JavaScript JIT compilers. These are read once on startup so a browser may
+
−# need to be restarted if toggling them. In general each subsequent JIT depends
+
−# on the ones before it being enabled.
+
−- name: javascript.options.blinterp
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.baselinejit
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.ion
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−# The irregexp JIT for regex evaluation.
+
−- name: javascript.options.native_regexp
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−# Jit Hints Cache - An in-process cache for the
+
−# content process to accelerate repeated baseline
+
−# compilations
+
−- name: javascript.options.jithints
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−# "Warm-up" thresholds at which we attempt to compile a script/function with
+
−# the next JIT tier.
+
−#
+
−# NOTE: These must match JitOptions defaults.
+
−- name: javascript.options.blinterp.threshold
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.baselinejit.threshold
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.ion.threshold
+
−  type: int32_t
+
−  value: 1500
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−# Enable off-main-thread Warp compilation.
+
−- name: javascript.options.ion.offthread_compilation
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−#ifdef DEBUG
+
−  # Enable extra correctness checks in the JITs that are slow and only available
+
−  # in debug builds.
+
−-   name: javascript.options.jit.full_debug_checks
+
−    type: bool
+
−    value: false
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−#endif
+
−
+
−# Heuristic threshold for Warp/Ion to decide that too many bailouts are
+
−# happening and an IonScript should be discarded.
+
−#
+
−# NOTE: This must match JitOptions defaults.
+
−- name: javascript.options.ion.frequent_bailout_threshold
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−# A threshold for Warp to decide whether a function can be inlined.
+
−# If the size of a function is smaller than this threshold, then it
+
−# may be inlined.
+
−#
+
−# NOTE: These must match JitOptions defaults.
+
−- name: javascript.options.inlining_bytecode_max_length
+
−  type: uint32_t
+
−  value: 130
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Whether the megamorphic property lookup cache is enabled.
+
−#
+
−# NOTE: This must match JitOptions defaults.
+
−- name: javascript.options.watchtower.megamorphic
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.compact_on_user_inactive
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The default amount of time to wait from the user being idle to starting a
+
−# shrinking GC. Measured in milliseconds.
+
−- name: javascript.options.compact_on_user_inactive_delay
+
−  type: uint32_t
+
−#ifdef NIGHTLY_BUILD
+
−  value: 15000
+
−#else
+
−  value: 300000
+
−#endif
+
−  mirror: always
+
−
+
−# Use better error message when accessing property of null or undefined.
+
−- name: javascript.options.property_error_message_fix
+
−  type: bool
+
−  value: @IS_NIGHTLY_OR_DEV_EDITION@
+
−  mirror: always
+
−
+
−# Support for weak references in JavaScript (WeakRef and FinalizationRegistry).
+
−- name: javascript.options.weakrefs
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to expose the FinalizationRegistry.prototype.cleanupSome method.
+
−- name: javascript.options.experimental.weakrefs.expose_cleanupSome
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# ShadowRealms: https://github.com/tc39/proposal-shadowrealm
+
−- name: javascript.options.experimental.shadow_realms
+
−  # Atomic, as we assert the preference, and that assertion may happen
+
−  # in a worker.
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef NIGHTLY_BUILD
+
−  # Experimental support for Iterator Helpers in JavaScript.
+
−-   name: javascript.options.experimental.iterator_helpers
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Experimental support for Array Grouping in JavaScript.
+
−-   name: javascript.options.experimental.array_grouping
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Experimental support for String.prototype.{is,to}WellFormed in JavaScript.
+
−-   name: javascript.options.experimental.well_formed_unicode_strings
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Experimental support for ArrayBuffer.prototype.transfer{,ToFixedLength}() in JavaScript.
+
−-   name: javascript.options.experimental.arraybuffer_transfer
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif  // NIGHTLY_BUILD
+
−
+
−#ifdef NIGHTLY_BUILD
+
−  # Experimental support for Import Assertions in JavaScript.
+
−-   name: javascript.options.experimental.import_assertions
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif  // NIGHTLY_BUILD
+
−
+
−  # Experimental support for change-array-by-copy methods
+
−- name: javascript.options.experimental.enable_change_array_by_copy
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Support Array.fromAsync
+
−- name: javascript.options.experimental.enable_array_from_async
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#if defined(ENABLE_NEW_SET_METHODS)
+
−  # Experimental support for New Set methods
+
−- name: javascript.options.experimental.enable_new_set_methods
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−- name: javascript.options.wasm_caching
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The amount of time we wait between a request to GC (due to leaving a page) and doing the actual GC, in ms.
+
−- name: javascript.options.gc_delay
+
−  type: uint32_t
+
−  value: 4000
+
−  mirror: always
+
−
+
−# The amount of time we wait from the first request to GC to actually doing the first GC, in ms.
+
−- name: javascript.options.gc_delay.first
+
−  type: uint32_t
+
−  value: 10000
+
−  mirror: always
+
−
+
−# After doing a zonal GC, wait this much time (in ms) and then do a full GC,
+
−# unless one is already pending.
+
−- name: javascript.options.gc_delay.full
+
−  type: uint32_t
+
−  value: 60000
+
−  mirror: always
+
−
+
−# Maximum amount of time that should elapse between incremental GC slices, in ms.
+
−- name: javascript.options.gc_delay.interslice
+
−  type: uint32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# nsJSEnvironmentObserver observes the memory-pressure notifications and
+
−# forces a garbage collection and cycle collection when it happens, if the
+
−# appropriate pref is set.
+
−- name: javascript.options.gc_on_memory_pressure
+
−  type: bool
+
−  # Disable the JS engine's GC on memory pressure, since we do one in the
+
−  # mobile browser (bug 669346).
+
−  # XXX: this value possibly should be changed, or the pref removed entirely.
+
−  #      See bug 1450787.
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# We allow at most MIN(max, MAX(NUM_CPUS / cpu_divisor, 1)) concurrent GCs
+
−# between processes
+
−- name: javascript.options.concurrent_multiprocess_gcs.cpu_divisor
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−# See 'cpu_divisor' above, 0 means UINT_32_MAX.
+
−- name: javascript.options.concurrent_multiprocess_gcs.max
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: javascript.options.mem.log
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: javascript.options.mem.notify
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the Parent process allocates and shares memory with all content
+
−# processes. This is mirrored once, as the parent process will do this
+
−# allocation early on.
+
−- name: javascript.options.self_hosted.use_shared_memory
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−- name: javascript.options.main_thread_stack_quota_cap
+
−  type: uint32_t
+
−#if defined(MOZ_ASAN)
+
−  value: 6 * 1024 * 1024
+
−#else
+
−  value: 2 * 1024 * 1024
+
−#endif
+
−  mirror: always
+
−
+
−- name: javascript.options.wasm_optimizingjit
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#if defined(ENABLE_WASM_RELAXED_SIMD)
+
−-   name: javascript.options.wasm_relaxed_simd
+
−    type: bool
+
−    value: @IS_NIGHTLY_BUILD@
+
−    mirror: always
+
−#endif  // defined(ENABLE_WASM_RELAXED_SIMD)
+
−
+
−#if defined(ENABLE_WASM_MOZ_INTGEMM)
+
−-   name: javascript.options.wasm_moz_intgemm
+
−    type: bool
+
−    value: @IS_NIGHTLY_BUILD@
+
−    mirror: always
+
−#endif  // defined(ENABLE_WASM_MOZ_INTGEMM)
+
−
+
−#if defined(ENABLE_WASM_EXTENDED_CONST)
+
−-   name: javascript.options.wasm_extended_const
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−#endif  // defined(ENABLE_WASM_EXTENDED_CONST)
+
−
+
−-   name: javascript.options.wasm_exceptions
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−
+
−#if defined(ENABLE_WASM_FUNCTION_REFERENCES)
+
−-   name: javascript.options.wasm_function_references
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif // defined(ENABLE_WASM_FUNCTION_REFERENCES)
+
−
+
−#if defined(ENABLE_WASM_GC)
+
−-   name: javascript.options.wasm_gc
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif // defined(ENABLE_WASM_GC)
+
−
+
−#if defined(ENABLE_WASM_MEMORY_CONTROL)
+
−-   name: javascript.options.wasm_memory_control
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif // defined(ENABLE_WASM_MEMORY_CONTROL)
+
−
+
−#if defined(ENABLE_WASM_SIMD)
+
−#if defined(JS_CODEGEN_X64) || defined(JS_CODEGEN_X86)
+
−  # Enables AVX instructions support on X86/X64 platforms.
+
−  # Changing these prefs requires a restart.
+
−-   name: javascript.options.wasm_simd_avx
+
−    type: bool
+
−    value: true
+
−    mirror: always
+
−#endif
+
−#endif
+
−
+
−#if defined(ENABLE_WASM_MEMORY64)
+
−-   name: javascript.options.wasm_memory64
+
−    type: bool
+
−    value: @IS_NIGHTLY_BUILD@
+
−    mirror: always
+
−#endif  // defined(ENABLE_WASM_MEMORY64)
+
−
+
−# Support for pretenuring allocations based on their allocation site.
+
−- name: javascript.options.site_based_pretenuring
+
−  type: bool
+
−  value: true
+
−  mirror: always  # LoadStartupJSPrefs
+
−  do_not_use_directly: true
+
−
+
−#if !defined(JS_CODEGEN_MIPS32) && !defined(JS_CODEGEN_MIPS64) && !defined(JS_CODEGEN_LOONG64)
+
−  # Spectre security vulnerability mitigations for the JS JITs.
+
−  #
+
−  # NOTE: The MIPS and LoongArch backends do not support these mitigations (and generally
+
−  #       do not need them). In that case, leave the pref unlisted with its
+
−  #       default value of false.
+
−-   name: javascript.options.spectre.index_masking
+
−    type: bool
+
−    value: true
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−
+
−-   name: javascript.options.spectre.object_mitigations
+
−    type: bool
+
−    value: true
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−
+
−-   name: javascript.options.spectre.string_mitigations
+
−    type: bool
+
−    value: true
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−
+
−-   name: javascript.options.spectre.value_masking
+
−    type: bool
+
−    value: true
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−
+
−-   name: javascript.options.spectre.jit_to_cxx_calls
+
−    type: bool
+
−    value: true
+
−    mirror: always  # LoadStartupJSPrefs
+
−    do_not_use_directly: true
+
−#endif  // !defined(JS_CODEGEN_MIPSXX) && !defined(JS_CODEGEN_LOONG64)
+
−
+
−# Separate pref to override the values of the Spectre-related prefs above for
+
−# isolated web content processes, where we don't need these mitigations.
+
−- name: javascript.options.spectre.disable_for_isolated_content
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether the W^X policy is enforced to mark JIT code pages as either writable
+
−# or executable but never both at the same time. OpenBSD defaults to W^X.
+
−- name: javascript.options.content_process_write_protect_code
+
−  type: bool
+
−#if defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to use the XPCOM thread pool for JS helper tasks.
+
−- name: javascript.options.external_thread_pool
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Whether to use the off-thread script compilation and decoding.
+
−- name: javascript.options.parallel_parsing
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use fdlibm for Math.sin, Math.cos, and Math.tan. When
+
−# privacy.resistFingerprinting is true, this pref is ignored and fdlibm is used
+
−# anyway.
+
−- name: javascript.options.use_fdlibm_for_sin_cos_tan
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to support parsing '//(#@) source(Mapping)?URL=' pragmas.
+
−- name: javascript.options.source_pragmas
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# asm.js
+
−- name: javascript.options.asmjs
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to throw a TypeError if asm.js code hits validation failure.
+
−- name: javascript.options.throw_on_asmjs_validation_failure
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "layers."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether to disable acceleration for all widgets.
+
−- name: layers.acceleration.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−  do_not_use_directly: true
+
−# Instead, use gfxConfig::IsEnabled(Feature::HW_COMPOSITING).
+
−
+
−# Whether to force acceleration on, ignoring blacklists.
+
−
+
−# bug 838603 -- on Android, accidentally blacklisting OpenGL layers
+
−# means a startup crash for everyone.
+
−# Temporarily force-enable GL compositing.  This is default-disabled
+
−# deep within the bowels of the widgetry system.  Remove me when GL
+
−# compositing isn't default disabled in widget/android.
+
−- name: layers.acceleration.force-enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−# Whether we allow AMD switchable graphics.
+
−- name: layers.amd-switchable-gfx.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether to use async panning and zooming.
+
−- name: layers.async-pan-zoom.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−  do_not_use_directly: true
+
−
+
−- name: layers.child-process-shutdown
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: layers.d3d11.force-warp
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: layers.d3d11.enable-blacklist
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Enable DEAA antialiasing for transformed layers in the compositor.
+
−- name: layers.deaa.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Force all possible layers to be always active layers.
+
−- name: layers.force-active
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layers.force-shmem-tiles
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: layers.draw-mask-debug
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layers.force-synchronous-resize
+
−  type: RelaxedAtomicBool
+
−#ifdef MOZ_WAYLAND
+
−  # We want to control it by nsWindow::SynchronouslyRepaintOnResize() on Linux/Wayland.
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−- name: layers.gpu-process.allow-software
+
−  type: bool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: layers.gpu-process.enabled
+
−  type: bool
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: once
+
−
+
−- name: layers.gpu-process.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: layers.gpu-process.ipc_reply_timeout_ms
+
−  type: int32_t
+
−  value: 10000
+
−  mirror: once
+
−
+
−# How many unstable GPU process restarts we allow for a given configuration.
+
−- name: layers.gpu-process.max_restarts
+
−  type: RelaxedAtomicInt32
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK) || defined(MOZ_WIDGET_ANDROID)
+
−  #if defined(NIGHTLY_BUILD)
+
−  value: 6
+
−  #else
+
−  value: 3
+
−  #endif
+
−#else
+
−  value: 1
+
−#endif
+
−  mirror: always
+
−
+
−# How many frames we must render before declaring the GPU process stable, and
+
−# allow restarts without it counting against our maximum restarts.
+
−- name: layers.gpu-process.stable.frame-threshold
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# How many milliseconds the GPU process must have lived before we accept that
+
−# it is stable, and allow restarts without it counting against our maximum
+
−# restarts.
+
−- name: layers.gpu-process.stable.min-uptime-ms
+
−  type: RelaxedAtomicInt32
+
−  value: 4 * 60000
+
−  mirror: always
+
−
+
−# Note: This pref will only be used if it is less than layers.gpu-process.max_restarts.
+
−- name: layers.gpu-process.max_restarts_with_decoder
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: layers.gpu-process.startup_timeout_ms
+
−  type: int32_t
+
−  value: 5000
+
−  mirror: once
+
−
+
−- name: layers.gpu-process.crash-also-crashes-browser
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to animate simple opacity and transforms on the compositor.
+
−- name: layers.offmainthreadcomposition.async-animations
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to log information about off main thread animations to stderr.
+
−- name: layers.offmainthreadcomposition.log-animations
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layers.offmainthreadcomposition.force-disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Compositor target frame rate. NOTE: If vsync is enabled the compositor
+
−# frame rate will still be capped.
+
−# -1 -> default (match layout.frame_rate or 60 FPS)
+
−# 0  -> full-tilt mode: Recomposite even if not transaction occured.
+
−- name: layers.offmainthreadcomposition.frame-rate
+
−  type: RelaxedAtomicInt32
+
−  value: -1
+
−  mirror: always
+
−
+
−#ifdef XP_WIN
+
−-   name: layers.prefer-opengl
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−#endif
+
−
+
−# Copy-on-write canvas.
+
−- name: layers.shared-buffer-provider.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: layers.recycle-allocator-rdd
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: layers.iosurfaceimage.recycle-limit
+
−  type: RelaxedAtomicUint32
+
−  value: 15
+
−  mirror: always
+
−
+
−- name: layers.iosurfaceimage.use-nv12
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "layout."
+
−#---------------------------------------------------------------------------
+
−
+
−# Debug-only pref to force enable the AccessibleCaret. If you want to
+
−# control AccessibleCaret by mouse, you'll need to set
+
−# "layout.accessiblecaret.hide_carets_for_mouse_input" to false.
+
−- name: layout.accessiblecaret.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable the accessible caret on platforms/devices
+
−# that we detect have touch support. Note that this pref is an
+
−# additional way to enable the accessible carets, rather than
+
−# overriding the layout.accessiblecaret.enabled pref.
+
−- name: layout.accessiblecaret.enabled_on_touch
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# By default, carets become tilt only when they are overlapping.
+
−- name: layout.accessiblecaret.always_tilt
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Show caret in cursor mode when long tapping on an empty content. This
+
−# also changes the default update behavior in cursor mode, which is based
+
−# on the emptiness of the content, into something more heuristic. See
+
−# AccessibleCaretManager::UpdateCaretsForCursorMode() for the details.
+
−- name: layout.accessiblecaret.caret_shown_when_long_tapping_on_empty_content
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# 0 = by default, always hide carets for selection changes due to JS calls.
+
−# 1 = update any visible carets for selection changes due to JS calls,
+
−#     but don't show carets if carets are hidden.
+
−# 2 = always show carets for selection changes due to JS calls.
+
−- name: layout.accessiblecaret.script_change_update_mode
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# Allow one caret to be dragged across the other caret without any limitation.
+
−# This matches the built-in convention for all desktop platforms.
+
−- name: layout.accessiblecaret.allow_dragging_across_other_caret
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Optionally provide haptic feedback on long-press selection events.
+
−- name: layout.accessiblecaret.hapticfeedback
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Smart phone-number selection on long-press is not enabled by default.
+
−- name: layout.accessiblecaret.extend_selection_for_phone_number
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Keep the accessible carets hidden when the user is using mouse input (as
+
−# opposed to touch/pen/etc.).
+
−- name: layout.accessiblecaret.hide_carets_for_mouse_input
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# CSS attributes (width, height, margin-left) of the AccessibleCaret in CSS
+
−# pixels.
+
−- name: layout.accessiblecaret.width
+
−  type: float
+
−  value: 34.0f
+
−  mirror: always
+
−
+
−- name: layout.accessiblecaret.height
+
−  type: float
+
−  value: 36.0f
+
−  mirror: always
+
−
+
−- name: layout.accessiblecaret.margin-left
+
−  type: float
+
−  value: -18.5f
+
−  mirror: always
+
−
+
−- name: layout.accessiblecaret.transition-duration
+
−  type: float
+
−  value: 250.0f
+
−  mirror: always
+
−
+
−# Simulate long tap events to select words. Mainly used in manual testing
+
−# with mouse.
+
−- name: layout.accessiblecaret.use_long_tap_injector
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# To support magnify glass, whether we dispatch additional chrome event such as
+
−# dragcaret.
+
−- name: layout.accessiblecaret.magnifier.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# One of several prefs affecting the maximum area to pre-render when animating
+
−# a large element on the compositor.
+
−# This pref enables transform (and transform like properties) animations on a
+
−# large element run on the compositor with rendering partial area of the
+
−# element on the main thread instead of rendering the whole area.  Once the
+
−# animation tried to composite out of the partial rendered area, the animation
+
−# is rendered again with the latest visible partial area.
+
−- name: layout.animation.prerender.partial
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# One of several prefs affecting the maximum area to pre-render when animating
+
−# a large element on the compositor.
+
−# This value is applied to both x and y axes and a perfect square contructed
+
−# by the greater axis value which will be capped by the absolute limits is used
+
−# for the partial pre-render area.
+
−- name: layout.animation.prerender.viewport-ratio-limit
+
−  type: AtomicFloat
+
−  value: 1.125f
+
−  mirror: always
+
−
+
−# One of several prefs affecting the maximum area to pre-render when animating
+
−# a large element on the compositor.
+
−- name: layout.animation.prerender.absolute-limit-x
+
−  type: RelaxedAtomicUint32
+
−  value: 4096
+
−  mirror: always
+
−
+
−# One of several prefs affecting the maximum area to pre-render when animating
+
−# a large element on the compositor.
+
−- name: layout.animation.prerender.absolute-limit-y
+
−  type: RelaxedAtomicUint32
+
−  value: 4096
+
−  mirror: always
+
−
+
−# Test-only pref, if this is true, partial pre-rendered transform animations
+
−# get stuck when it reaches to the pre-rendered boundaries and the pre-render
+
−# region is never updated.
+
−- name: layout.animation.prerender.partial.jank
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Override DPI. A value of -1 means use the maximum of 96 and the system DPI.
+
−# A value of 0 means use the system DPI. A positive value is used as the DPI.
+
−# This sets the physical size of a device pixel and thus controls the
+
−# interpretation of physical units such as "pt".
+
−- name: layout.css.dpi
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# Whether Container Queries are enabled
+
−- name: layout.css.container-queries.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether trigonometric constants and functions are enabled in calc().
+
−- name: layout.css.trig.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the round() function is enabled in calc().
+
−- name: layout.css.round.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the mod() / rem() functions are enabled in calc().
+
−- name: layout.css.mod-rem.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether exponential functions are enabled in calc().
+
−- name: layout.css.exp.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether sign/abs functions are enabled in calc().
+
−- name: layout.css.abs-sign.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether infinity / nan constants are enabled in calc().
+
−- name: layout.css.nan-inf.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether CSS nesting is enabled.
+
−- name: layout.css.nesting.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Should we look for counter ancestor scopes first?
+
−- name: layout.css.counter-ancestor-scope.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Make `zoom` a `transform` + `transform-origin` alias.
+
−- name: layout.css.zoom-transform-hack.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the `-moz-control-character-visibility` property is exposed to
+
−# content.
+
−#
+
−# Only for testing purposes.
+
−- name: layout.css.moz-control-character-visibility.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# This pref controls whether the `prefers-color-scheme` value of iframes images
+
−# reacts to the embedder `color-scheme` in content.
+
−- name: layout.css.iframe-embedder-prefers-color-scheme.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The minimum contrast ratio between the accent color foreground and background
+
−# colors.
+
−#
+
−# We don't use this for text, so we need a contrast of at least AA (for user
+
−# interface components and graphical objects), which per WCAG is 3:1
+
−- name: layout.css.accent-color.min-contrast-ratio
+
−  type: AtomicFloat
+
−  value: 3.0
+
−  mirror: always
+
−
+
−# The target contrast ratio between the accent color foreground and background
+
−# colors when darkening.
+
−#
+
−# We aim a bit further than the minimum contrast ratio, which seems to provide
+
−# nice results in practice.
+
−- name: layout.css.accent-color.darkening-target-contrast-ratio
+
−  type: AtomicFloat
+
−  value: 6.0
+
−  mirror: always
+
−
+
−# Whether the `animation-composition` in css-animations-2 is enabled.
+
−- name: layout.css.animation-composition.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is the codepath for using cached scrollbar styles enabled?
+
−- name: layout.css.cached-scrollbar-styles.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we cache inline styles in a document unconditionally or not.
+
−- name: layout.css.inline-style-caching.always-enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether computed local-fragment-only image urls serialize using the same
+
−# rules as filter/mask/etc (not resolving the URL for local refs).
+
−#
+
−# See https://github.com/w3c/csswg-drafts/issues/3195
+
−- name: layout.css.computed-style.dont-resolve-image-local-refs
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether we should expose all shorthands in getComputedStyle().
+
−- name: layout.css.computed-style.shorthands
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we should avoid exposing styles of elements outside the flat tree in getComputedStyle().
+
−- name: layout.css.computed-style.styles-outside-flat-tree
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Are implicit tracks in computed grid templates serialized?
+
−- name: layout.css.serialize-grid-implicit-tracks
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the system-ui generic family is enabled.
+
−- name: layout.css.system-ui.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the rule hash is applied to attribute names too, not
+
−# only classes / id / namespaces / etc.
+
−- name: layout.css.bucket-attribute-names.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Set the number of device pixels per CSS pixel. A value <= 0 means choose
+
−# automatically based on user settings for the platform (e.g., "UI scale factor"
+
−# on Mac). If browser.display.os-zoom-behavior == 1, then a positive value
+
−# will be multiplied by the text scale factor; otherwise a positive value is
+
−# used as-is. This controls the size of a CSS "px" at 100% full-zoom.
+
−# The size of system fonts is also changed in proportion with the change in
+
−# "px" sizes. Use "ui.textScaleFactor" instead to only change the size of "px".
+
−# This is only used for windows on the screen, not for printing.
+
−- name: layout.css.devPixelsPerPx
+
−  type: AtomicFloat
+
−  value: -1.0f
+
−  mirror: always
+
−
+
−# Is support for CSS backdrop-filter enabled?
+
−- name: layout.css.backdrop-filter.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Do we override the blocklist for CSS backdrop-filter?
+
−- name: layout.css.backdrop-filter.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for rect() enabled?
+
−- name: layout.css.basic-shape-rect.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for xywh() enabled?
+
−- name: layout.css.basic-shape-xywh.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Should stray control characters be rendered visibly?
+
−- name: layout.css.control-characters.visible
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the `content-visibility` CSS property is enabled
+
−- name: layout.css.content-visibility.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether the `contain-intrinsic-size` CSS property is enabled
+
−- name: layout.css.contain-intrinsic-size.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for GeometryUtils.convert*FromNode enabled?
+
−- name: layout.css.convertFromNode.enabled
+
−  type: bool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: always
+
−
+
−- name: layout.css.cross-fade.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−- name: layout.css.linear-easing-function.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for color-mix on content enabled?
+
−- name: layout.css.color-mix.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for light-dark() on content enabled?
+
−- name: layout.css.light-dark.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for color-mix with non-SRGB color spaces on content enabled?
+
−- name: layout.css.color-mix.color-spaces.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for fit-content() enabled?
+
−- name: layout.css.fit-content-function.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether to use tight bounds for floating ::first-letter (legacy Gecko behavior)
+
−# or loose bounds based on overall font metrics (WebKit/Blink-like behavior)?
+
−# Values mean:
+
−#     1   legacy Gecko behavior (tight bounds)
+
−#     0   loose typographic bounds (similar to webkit/blink)
+
−#    -1   auto behavior: use loose bounds if reduced line-height (<1em) or negative
+
−#         block-start margin is present; otherwise use tight bounds.
+
−- name: layout.css.floating-first-letter.tight-glyph-bounds
+
−  type: int32_t
+
−#ifdef NIGHTLY_BUILD
+
−  value: -1
+
−#else
+
−  value: 1
+
−#endif
+
−  mirror: always
+
−
+
−# Is support for the font-display @font-face descriptor enabled?
+
−- name: layout.css.font-display.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for document.fonts enabled?
+
−- name: layout.css.font-loading-api.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for workerGlobalScope.fonts enabled?
+
−- name: layout.css.font-loading-api.workers.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for the @font-face metrics override descriptors enabled?
+
−- name: layout.css.font-metrics-overrides.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for the @font-palette-values rule and font-palette property enabled?
+
−- name: layout.css.font-palette.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for variation fonts enabled?
+
−- name: layout.css.font-variations.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for the size-adjust @font-face descriptor enabled?
+
−- name: layout.css.size-adjust.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is the optional adjustment-basis value for font-size-adjust enabled?
+
−- name: layout.css.font-size-adjust.basis.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for the tech() function in the @font-face src descriptor enabled?
+
−- name: layout.css.font-tech.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for font-variant-emoji enabled?
+
−- name: layout.css.font-variant-emoji.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Visibility level of font families available to CSS font-matching:
+
−#   1 - only base system fonts
+
−#   2 - also fonts from optional language packs
+
−#   3 - also user-installed fonts
+
−- name: layout.css.font-visibility.standard
+
−  type: int32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−# font-visibility setting when Tracking Protection is enabled
+
−- name: layout.css.font-visibility.trackingprotection
+
−  type: int32_t
+
−  value: 3
+
−  mirror: always
+
−
+
−# Max font-visibility setting for Private Browsing contexts
+
−# (The actual value used in a private-browsing context will be the lesser of
+
−# the appropriate standard/trackingprotection/RFP value from above, and the
+
−# private-browsing level specified by this pref.)
+
−- name: layout.css.font-visibility.private
+
−  type: int32_t
+
−#if defined(NIGHTLY_BUILD)
+
−  value: 2
+
−#else
+
−  value: 3
+
−#endif
+
−  mirror: always
+
−
+
−# Is support for GeometryUtils.getBoxQuads enabled?
+
−- name: layout.css.getBoxQuads.enabled
+
−  type: bool
+
−  value: @IS_NOT_RELEASE_OR_BETA@
+
−  mirror: always
+
−
+
−# Is support for (linear|radial|conic)-gradient color interpolation methods enabled?
+
−- name: layout.css.gradient-color-interpolation-method.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for caching an grid item's block axis measurement enabled?
+
−- name: layout.css.grid-item-baxis-measurement.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CSS masonry layout enabled?
+
−- name: layout.css.grid-template-masonry-value.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for :has() enabled?
+
−- name: layout.css.has-selector.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for CSS hyphenate-character enabled?
+
−- name: layout.css.hyphenate-character.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CSS individual transform enabled?
+
−- name: layout.css.individual-transform.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for CSS initial-letter property enabled?
+
−- name: layout.css.initial-letter.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref to control whether line-height: -moz-block-height is exposed to content.
+
−- name: layout.css.line-height-moz-block-height.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for motion-path enabled?
+
−- name: layout.css.motion-path.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for motion-path <basic-shape> other than path() enabled?
+
−# https://drafts.fxtf.org/motion-1/#valdef-offset-path-basic-shape
+
−- name: layout.css.motion-path-basic-shapes.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for motion-path <coord-box> enabled?
+
−# https://drafts.fxtf.org/motion-1/#valdef-offset-path-coord-box
+
−- name: layout.css.motion-path-coord-box.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for motion-path ray() enabled?
+
−- name: layout.css.motion-path-ray.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for motion-path offset-position enabled?
+
−- name: layout.css.motion-path-offset-position.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Pref to control whether the ::marker property restrictions defined in [1]
+
−# apply.
+
−#
+
−# [1]: https://drafts.csswg.org/css-pseudo-4/#selectordef-marker
+
−- name: layout.css.marker.restricted
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for math-style enabled?
+
−- name: layout.css.math-style.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for math-depth enabled?
+
−- name: layout.css.math-depth.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Pref to control whether @-moz-document rules are enabled in content pages.
+
−- name: layout.css.moz-document.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is -moz-osx-font-smoothing enabled? (Only supported in OSX builds)
+
−- name: layout.css.osx-font-smoothing.enabled
+
−  type: bool
+
−#if defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Is support for CSS overflow-clip-box enabled for non-UA sheets?
+
−- name: layout.css.overflow-clip-box.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for CSS overflow: -moz-hidden-unscrollable enabled
+
−- name: layout.css.overflow-moz-hidden-unscrollable.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for CSS overflow: overlay enabled
+
−- name: layout.css.overflow-overlay.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for overscroll-behavior enabled?
+
−- name: layout.css.overscroll-behavior.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: layout.css.overflow-logical.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables support for the page-orientation  property inside of CSS @page rules.
+
−- name: layout.css.page-orientation.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Enables support for the size property inside of CSS @page rules.
+
−- name: layout.css.page-size.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Enables support for different CSS page sizes on each page when printing.
+
−- name: layout.css.allow-mixed-page-sizes
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Whether Properties and Values is enabled
+
−- name: layout.css.properties-and-values.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−# Dictates whether or not the prefers contrast media query will be
+
−# usable.
+
−#   true: prefers-contrast will toggle based on OS and browser settings.
+
−#   false: prefers-contrast will only parse and toggle in the browser
+
−#   chrome and ua.
+
−- name: layout.css.prefers-contrast.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# An override for prefers-color-scheme for content documents.
+
−#   0: Dark
+
−#   1: Light
+
−#   2: Auto (system color scheme unless overridden by browser theme)
+
−- name: layout.css.prefers-color-scheme.content-override
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−
+
−# Dictates whether or not the forced-colors media query is enabled.
+
−- name: layout.css.forced-colors.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Dictates whether or not the prefers-reduced-transparency media query is enabled.
+
−- name: layout.css.prefers-reduced-transparency.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Dictates whether or not the inverted-colors media query is enabled.
+
−- name: layout.css.inverted-colors.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for forced-color-adjust properties enabled?
+
−- name: layout.css.forced-color-adjust.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is support for -moz-prefixed animation properties enabled?
+
−- name: layout.css.prefixes.animations
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -moz-border-image enabled?
+
−- name: layout.css.prefixes.border-image
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -moz-box-sizing enabled?
+
−- name: layout.css.prefixes.box-sizing
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -moz-prefixed font feature properties enabled?
+
−- name: layout.css.prefixes.font-features
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -moz-prefixed transform properties enabled?
+
−- name: layout.css.prefixes.transforms
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -moz-prefixed transition properties enabled?
+
−- name: layout.css.prefixes.transitions
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is CSS error reporting enabled?
+
−- name: layout.css.report_errors
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Are inter-character ruby annotations enabled?
+
−- name: layout.css.ruby.intercharacter.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layout.css.scroll-behavior.damping-ratio
+
−  type: AtomicFloat
+
−  value: 1.0f
+
−  mirror: always
+
−
+
−# Tuning of the smooth scroll motion used by CSSOM-View scroll-behavior.
+
−# Spring-constant controls the strength of the simulated MSD
+
−# (Mass-Spring-Damper).
+
−- name: layout.css.scroll-behavior.spring-constant
+
−  type: AtomicFloat
+
−  value: 250.0f
+
−  mirror: always
+
−
+
−# Whether the scroll-driven animations generated by CSS is enabled. This
+
−# also include animation-timelime property.
+
−- name: layout.css.scroll-driven-animations.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# When selecting the snap point for CSS scroll snapping, the velocity of the
+
−# scroll frame is clamped to this speed, in CSS pixels / s.
+
−- name: layout.css.scroll-snap.prediction-max-velocity
+
−  type: RelaxedAtomicInt32
+
−  value: 2000
+
−  mirror: always
+
−
+
−#  When selecting the snap point for CSS scroll snapping, the velocity of the
+
−# scroll frame is integrated over this duration, in seconds.  The snap point
+
−# best suited for this position is selected, enabling the user to perform fling
+
−# gestures.
+
−- name: layout.css.scroll-snap.prediction-sensitivity
+
−  type: AtomicFloat
+
−  value: 0.750f
+
−  mirror: always
+
−
+
−# Set the threshold distance in CSS pixels below which scrolling will snap to
+
−# an edge, when scroll snapping is set to "proximity".
+
−- name: layout.css.scroll-snap.proximity-threshold
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−
+
−# Stylo thread-pool size.
+
−# Negative means auto, 0 disables the thread-pool (main-thread styling), other
+
−# numbers override as specified.
+
−# Note that 1 still creates a thread-pool of one thread!
+
−- name: layout.css.stylo-threads
+
−  type: int32_t
+
−  value: -1
+
−  mirror: once
+
−  rust: true
+
−
+
−# Stylo work unit size. This is the amount of nodes we'll process in a single
+
−# unit of work of the thread-pool.
+
−#
+
−# Larger values will increase style sharing cache hits and general DOM locality
+
−# at the expense of decreased opportunities for parallelism.  There are some
+
−# measurements in bug 1385982 comments 11, 12, 13 that investigate some
+
−# slightly different values for the work unit size.
+
−#
+
−# If the size is significantly increased, make sure to also review
+
−# stylo-local-work-queue prefs, since we might end up doing too much work
+
−# sequentially.
+
−#
+
−# A value of 0 disables parallelism altogether.
+
−- name: layout.css.stylo-work-unit-size
+
−  type: RelaxedAtomicUint32
+
−  value: 16
+
−  mirror: always
+
−  rust: true
+
−
+
−# The minimum amount of work that a thread doing styling will try to keep
+
−# locally before sending work to other threads, in a worker.
+
−- name: layout.css.stylo-local-work-queue.in-worker
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−  rust: true
+
−
+
−# As above but for the main thread. The main thread can't really steal from
+
−# other threads so it might want a bigger min queue size before giving work to
+
−# other threads.
+
−- name: layout.css.stylo-local-work-queue.in-main-thread
+
−  type: RelaxedAtomicUint32
+
−  value: 32
+
−  mirror: always
+
−  rust: true
+
−
+
−# Are counters for implemented CSS properties enabled?
+
−- name: layout.css.use-counters.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Are counters for unimplemented CSS properties enabled?
+
−- name: layout.css.use-counters-unimplemented.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Should the :visited selector ever match (otherwise :link matches instead)?
+
−- name: layout.css.visited_links_enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable experimental enhanced color CSS color spaces. (lab(), lch(), oklab(), oklch(), color())
+
−- name: layout.css.more_color_4.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# The margin used for detecting relevancy for `content-visibility: auto`.
+
−- name: layout.css.content-visibility-relevant-content-margin
+
−  type: float
+
−  value: 50 # 50%
+
−  mirror: always
+
−
+
−# Whether the "modern" uppercase mapping of ß to ẞ (rather than SS) is used.
+
−- name: layout.css.text-transform.uppercase-eszett.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to block large cursors intersecting UI.
+
−- name: layout.cursor.block.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum width or height of the cursor we should allow when intersecting
+
−# the UI, in CSS pixels.
+
−- name: layout.cursor.block.max-size
+
−  type: uint32_t
+
−  value: 32
+
−  mirror: always
+
−
+
−- name: layout.display-list.build-twice
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Toggle retaining display lists between paints.
+
−- name: layout.display-list.retain
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Toggle retaining display lists between paints.
+
−- name: layout.display-list.retain.chrome
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: layout.display-list.retain.sc
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Set the maximum number of modified frames allowed before doing a full
+
−# display list rebuild.
+
−- name: layout.display-list.rebuild-frame-limit
+
−  type: RelaxedAtomicUint32
+
−  value: 500
+
−  mirror: always
+
−
+
−# Pref to dump the display list to the log. Useful for debugging drawing.
+
−- name: layout.display-list.dump
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref to dump the display list to the log. Useful for debugging drawing.
+
−- name: layout.display-list.dump-content
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref to dump the display list to the log. Useful for debugging drawing.
+
−- name: layout.display-list.dump-parent
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layout.display-list.show-rebuild-area
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layout.display-list.improve-fragmentation
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Are dynamic reflow roots enabled?
+
−- name: layout.dynamic-reflow-roots.enabled
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Enables the mechanism to optimize away flex item's final reflow.
+
−# Warning: Disabling the pref will impact the performance. This is useful only for
+
−# debugging flexbox issues.
+
−- name: layout.flexbox.item-final-reflow-optimization.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables the <input type=search> custom layout frame with a clear icon.
+
−# Still needs tests and a web-exposed way to remove that icon, see bug 1654288.
+
−- name: layout.forms.input-type-search.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables the Reveal Password button inside a <input type=password>.
+
−- name: layout.forms.reveal-password-button.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables the Reveal Password context-menu entry.
+
−- name: layout.forms.reveal-password-context-menu.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Pref to control browser frame rate, in Hz. A value <= 0 means choose
+
−# automatically based on knowledge of the platform (or 60Hz if no platform-
+
−# specific information is available).
+
−- name: layout.frame_rate
+
−  type: RelaxedAtomicInt32
+
−  value: -1
+
−  mirror: always
+
−
+
−# If it has been this many frame periods since a refresh, assume that painting
+
−# is quiescent (will not happen again soon).
+
−- name: layout.idle_period.required_quiescent_frames
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# The amount of time (milliseconds) needed between an idle period's
+
−# end and the start of the next tick to avoid jank.
+
−- name: layout.idle_period.time_limit
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# The minimum amount of time (milliseconds) required to be remaining
+
−# in the current vsync interval for us to attempt an extra tick, or
+
−# <0 to disable extra ticks entirely.
+
−- name: layout.extra-tick.minimum-ms
+
−  type: int32_t
+
−  value: 4
+
−  mirror: always
+
−
+
−# Whether to load the broken image icon eagerly. This is mostly needed for
+
−# reftests, since the broken image icon doesn't block the load event and thus
+
−# there's no easy way to guarantee it's loaded.
+
−- name: layout.image.eager_broken_image_icon
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable/disable interruptible reflow, which allows reflows to stop
+
−# before completion (and display the partial results) when user events
+
−# are pending.
+
−- name: layout.interruptible-reflow.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# On Android, don't synth mouse move events after scrolling, as they cause
+
−# unexpected user-visible behaviour. Can remove this after bug 1633450 is
+
−# satisfactorily resolved.
+
−- name: layout.reflow.synthMouseMove
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# This pref is to be set by test code only.
+
−- name: layout.scrollbars.always-layerize-track
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layout.scrollbars.click_and_hold_track.continue_to_end
+
−  type: bool
+
−# On Linux, click-and-hold on the scrollbar track should continue scrolling
+
−# until the mouse is released. On the other platforms we want to stop
+
−# scrolling as soon as the scrollbar thumb has reached the current mouse
+
−# position.
+
−#ifdef MOZ_WIDGET_GTK
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Whether anchor is kept selected.
+
−- name: layout.selectanchor
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Controls caret style and word-delete during text selection.
+
−# 0: Use platform default
+
−# 1: Caret moves and blinks as when there is no selection; word
+
−#    delete deselects the selection and then deletes word.
+
−# 2: Caret moves to selection edge and is not visible during selection;
+
−#    word delete deletes the selection (Mac and Linux default).
+
−# 3: Caret moves and blinks as when there is no selection; word delete
+
−#    deletes the selection.
+
−# Windows default is 1 for word delete behavior, the rest as for 2.
+
−- name: layout.selection.caret_style
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# If layout.show_previous_page is true then during loading of a new page we
+
−# will draw the previous page if the new page has painting suppressed.
+
−- name: layout.show_previous_page
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Pref to stop overlay scrollbars from fading out, for testing purposes.
+
−- name: layout.testing.overlay-scrollbars.always-visible
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Throttled frame rate, in frames per second.
+
−- name: layout.throttled_frame_rate
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Whether we should throttle in-process iframes in the active tab.
+
−- name: layout.throttle_in_process_iframes
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Activity granted to out-of-process iframes in the foreground tab, in milliseconds.
+
−- name: layout.oopif_activity_grace_period_ms
+
−  type: uint32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: layout.lower_priority_refresh_driver_during_load
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# If > 0, nsRefreshDriver will keep ticking this amount of milliseconds after
+
−# top level page load.
+
−- name: layout.keep_ticking_after_load_ms
+
−  type: uint32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Pref to control enabling scroll anchoring.
+
−- name: layout.css.scroll-anchoring.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Pref to control whether to suspend also RefreshDriver::Tick when the page
+
−# itself is suspended because of some synchronous operation, like sync XHR.
+
−- name: layout.skip_ticks_while_page_suspended
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Pref to control how many consecutive scroll-anchoring adjustments (since the
+
−# most recent user scroll or timeout) we'll average, before we consider whether
+
−# to automatically turn off scroll anchoring. When we hit this threshold, the
+
−# actual decision to disable also depends on the
+
−# min-average-adjustment-threshold pref, see below for more details.
+
−#
+
−# Zero disables the heuristic.
+
−- name: layout.css.scroll-anchoring.max-consecutive-adjustments
+
−  type: uint32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−# Whether to reset counting the consecutive scroll-anchoring adjustments during
+
−# running async scrolling by APZ.
+
−- name: layout.css.scroll-anchoring.reset-heuristic-during-animation
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# The time after which we reset the max-consecutive-adjustments period, in
+
−# milliseconds.
+
−#
+
−# This prevents sporadic back-and-forth scroll anchoring to trigger the
+
−# max-consecutive-adjustments heuristic.
+
−- name: layout.css.scroll-anchoring.max-consecutive-adjustments-timeout-ms
+
−  type: uint32_t
+
−  value: 500
+
−  mirror: always
+
−
+
−# Pref to control whether we should disable scroll anchoring on a scroller
+
−# where at least max-consecutive-adjustments have happened, and which the
+
−# average adjustment ends up being less than this number, in CSS pixels.
+
−#
+
−# So, for example, given max-consecutive-adjustments=10 and
+
−# min-average-adjustment-treshold=3, we'll block scroll anchoring if there have
+
−# been 10 consecutive adjustments without a user scroll or more, and the
+
−# average offset difference between them amount to less than 3 CSS pixels.
+
−- name: layout.css.scroll-anchoring.min-average-adjustment-threshold
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Pref to control disabling scroll anchoring suppression triggers, see
+
−#
+
−# https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers
+
−#
+
−# Those triggers should be unnecessary after bug 1561450.
+
−- name: layout.css.scroll-anchoring.suppressions.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: layout.css.scroll-anchoring.highlight
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref to control whether we reselect scroll anchors if sub-optimal
+
−#
+
−# See https://github.com/w3c/csswg-drafts/issues/6787
+
−- name: layout.css.scroll-anchoring.reselect-if-suboptimal
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Are shared memory User Agent style sheets enabled?
+
−- name: layout.css.shared-memory-ua-sheets.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for -webkit-line-clamp on regular blocks enabled?
+
−- name: layout.css.webkit-line-clamp.block.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Is support for -webkit-slider* pseudos enabled?
+
−- name: layout.css.webkit-range-pseudos.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Is 'content:none' supported on (non-pseudo) elements?
+
−- name: layout.css.element-content-none.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether we want scrollbar-width: thin to behave as scrollbar-width: auto.
+
−- name: layout.css.scrollbar-width-thin.disabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether the `scrollbar-gutter` CSS property is enabled.
+
−- name: layout.css.scrollbar-gutter.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether supports() conditions in @import is enabled
+
−- name: layout.css.import-supports.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether frame visibility tracking is enabled globally.
+
−- name: layout.framevisibility.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The fraction of the scrollport we allow to horizontally scroll by before we
+
−# schedule an update of frame visibility.
+
−- name: layout.framevisibility.amountscrollbeforeupdatehorizontal
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# The fraction of the scrollport we allow to vertically scroll by before we
+
−# schedule an update of frame visibility.
+
−- name: layout.framevisibility.amountscrollbeforeupdatevertical
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# The number of scrollports wide to expand when tracking frame visibility.
+
−- name: layout.framevisibility.numscrollportwidths
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 1
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# The number of scrollports high to expand when tracking frame visibility.
+
−- name: layout.framevisibility.numscrollportheights
+
−  type: uint32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Test only.
+
−- name: layout.dynamic-toolbar-max-height
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Whether outlines should include all overflowing descendants, or just the
+
−# border-box of a given element.
+
−#
+
−# Historically we have included descendants but other browsers have not.
+
−- name: layout.outline.include-overflow
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: layout.visibility.min-recompute-interval-ms
+
−  type: uint32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Controls double click and Alt+Arrow word selection behavior.
+
−- name: layout.word_select.eat_space_to_next_word
+
−  type: bool
+
−#ifdef XP_WIN
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: layout.word_select.stop_at_punctuation
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether underscore should be treated as a word-breaking character for
+
−# word selection/arrow-key movement purposes.
+
−- name: layout.word_select.stop_at_underscore
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Should deprecated plugin behavior fallback to normal behavior or use
+
−# the experimental design.
+
−- name: layout.use-plugin-fallback
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to draw images in CSS backgrounds if we only have a partial frame.
+
−- name: layout.display_partial_background_images
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Controls whether nsRefreshDriver::IsInHighRateMode() may ever return true.
+
−- name: layout.expose_high_rate_mode_from_refreshdriver
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "mathml."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether to disable layout of invalid markup as an error message.
+
−- name: mathml.error_message_layout_for_invalid_markup.disabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to disable MathML3 implementations for maction and semantics.
+
−- name: mathml.legacy_maction_and_semantics_implementations.disabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Whether to disable legacy names "thickmathspace", "mediummathspace",
+
−# "thickmathspace" etc for length attributes.
+
−- name: mathml.mathspace_names.disabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to disable support for stretching operators with STIXGeneral fonts.
+
−# macos still has the deprecated STIXGeneral font pre-installed.
+
−- name: mathml.stixgeneral_operator_stretching.disabled
+
−  type: bool
+
−#if defined(XP_MACOSX)
+
−  value: @IS_NIGHTLY_BUILD@
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to disable fallback for mathvariant=italic/bold/bold-italic via
+
−# styling when lacking proper fonts for Mathematical Alphanumeric Symbols.
+
−# We expect all OSes to have relevant fonts, except Android, see bug 1789083.
+
−- name: mathml.mathvariant_styling_fallback.disabled
+
−  type: bool
+
−#if defined(ANDROID)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to disable the MathML3 support for the mathvariant attribute. For
+
−# MathML Core, support is restricted to the <mi> element and to value "normal".
+
−# Corresponding automatic italicization on single-char <mi> element is also
+
−# implemented via text-transform: auto when that flag is enabled.
+
−- name: mathml.legacy_mathvariant_attribute.disabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−  rust: true
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "media."
+
−#---------------------------------------------------------------------------
+
−
+
−
+
−# This pref defines what the blocking policy would be used in blocking autoplay.
+
−# 0 : use sticky activation (default)
+
−# https://html.spec.whatwg.org/multipage/interaction.html#sticky-activation
+
−# 1 : use transient activation (the transient activation duration can be
+
−#     adjusted by the pref `dom.user_activation.transient.timeout`)
+
−# https://html.spec.whatwg.org/multipage/interaction.html#transient-activation
+
−# 2 : user input depth (allow autoplay when the play is trigged by user input
+
−#     which is determined by the user input depth)
+
−- name: media.autoplay.blocking_policy
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# Whether to allow autoplay on extension background pages.
+
−- name: media.autoplay.allow-extension-background-pages
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block autoplay, asking for permission by default.
+
−# 0=Allowed, 1=Blocked, 5=All Blocked
+
−- name: media.autoplay.default
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Wether to block autoplay for webaudio
+
−- name: media.autoplay.block-webaudio
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# File-backed MediaCache size.
+
−- name: media.cache_size
+
−  type: RelaxedAtomicUint32
+
−  value: 512000   # Measured in KiB
+
−  mirror: always
+
−
+
−# Size of file backed MediaCache while on a connection which is cellular (3G,
+
−# etc), and thus assumed to be "expensive".
+
−- name: media.cache_size.cellular
+
−  type: RelaxedAtomicUint32
+
−  value: 32768   # Measured in KiB
+
−  mirror: always
+
−
+
−# Whether cubeb is sandboxed (AudioIPC)
+
−- name: media.cubeb.sandbox
+
−  type: bool
+
−  mirror: always
+
−#if defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID) || defined(XP_WIN) || defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−
+
−# Whether or not to pass AUDCLNT_STREAMOPTIONS_RAW when initializing audio
+
−# streams when using WASAPI.
+
−# 0 - don't use RAW streams
+
−# 1 - use RAW streams for input streams only
+
−# 2 - use RAW streams for output streams only
+
−# 3 - use RAW streams for input and output streams
+
−#if defined (XP_WIN)
+
−- name: media.cubeb.wasapi-raw
+
−  type: RelaxedAtomicUint32
+
−  mirror: always
+
−  value: 0
+
−#endif // XP_WIN
+
−
+
−# Whether to make the start of cubeb stream slower, and by how many
+
−# milliseconds.
+
−- name: media.cubeb.slow_stream_init_ms
+
−  type: RelaxedAtomicUint32
+
−  mirror: always
+
−  value: 0
+
−
+
−# ClockDrift desired buffering in milliseconds
+
−- name: media.clockdrift.buffering
+
−  type: RelaxedAtomicUint32
+
−  mirror: always
+
−  value: 50
+
−
+
−# If a resource is known to be smaller than this size (in kilobytes), a
+
−# memory-backed MediaCache may be used; otherwise the (single shared global)
+
−# file-backed MediaCache is used.
+
−- name: media.memory_cache_max_size
+
−  type: uint32_t
+
−  value: 8192        # Measured in KiB
+
−  mirror: always
+
−
+
−# Don't create more memory-backed MediaCaches if their combined size would go
+
−# above this absolute size limit.
+
−- name: media.memory_caches_combined_limit_kb
+
−  type: uint32_t
+
−  value: 524288
+
−  mirror: always
+
−
+
−# Don't create more memory-backed MediaCaches if their combined size would go
+
−# above this relative size limit (a percentage of physical memory).
+
−- name: media.memory_caches_combined_limit_pc_sysmem
+
−  type: uint32_t
+
−  value: 5           # A percentage
+
−  mirror: always
+
−
+
−# When a network connection is suspended, don't resume it until the amount of
+
−# buffered data falls below this threshold (in seconds).
+
−- name: media.cache_resume_threshold
+
−  type: RelaxedAtomicUint32
+
−  value: 30
+
−  mirror: always
+
−- name: media.cache_resume_threshold.cellular
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# Stop reading ahead when our buffered data is this many seconds ahead of the
+
−# current playback position. This limit can stop us from using arbitrary
+
−# amounts of network bandwidth prefetching huge videos.
+
−- name: media.cache_readahead_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 60
+
−  mirror: always
+
−- name: media.cache_readahead_limit.cellular
+
−  type: RelaxedAtomicUint32
+
−  value: 30
+
−  mirror: always
+
−
+
−# MediaCapabilities
+
−- name: media.mediacapabilities.drop-threshold
+
−  type: RelaxedAtomicInt32
+
−  value: 95
+
−  mirror: always
+
−
+
−- name: media.mediacapabilities.from-database
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# AudioSink
+
−- name: media.resampling.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# libcubeb backend implements .get_preferred_channel_layout
+
−- name: media.forcestereo.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN) || defined(XP_DARWIN) || defined(MOZ_PULSEAUDIO)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# MediaSource
+
−
+
−# Whether to enable MediaSource support.
+
−- name: media.mediasource.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.mediasource.mp4.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.mediasource.webm.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Check if vp9 is enabled by default in mediasource. False on Android.
+
−# If disabled, vp9 will only be enabled under some conditions:
+
−# - h264 HW decoding is not supported
+
−# - mp4 is not enabled
+
−# - Device was deemed fast enough to decode VP9 via the VP9Benchmark utility
+
−# - A VP9 HW decoder is present.
+
−- name: media.mediasource.vp9.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−- name: media.mediasource.webm.audio.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to enable MediaSource v2 support.
+
−- name: media.mediasource.experimental.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# VideoSink
+
−- name: media.ruin-av-sync.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Encrypted Media Extensions
+
−- name: media.eme.enabled
+
−  type: bool
+
−#if defined(XP_LINUX) && !defined(MOZ_WIDGET_ANDROID)
+
−  # On Linux EME is visible but disabled by default. This is so that the "Play
+
−  # DRM content" checkbox in the Firefox UI is unchecked by default. DRM
+
−  # requires downloading and installing proprietary binaries, which users on an
+
−  # open source operating systems didn't opt into. The first time a site using
+
−  # EME is encountered, the user will be prompted to enable DRM, whereupon the
+
−  # EME plugin binaries will be downloaded if permission is granted.
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether we expose the functionality proposed in
+
−# https://github.com/WICG/encrypted-media-encryption-scheme/blob/master/explainer.md
+
−# I.e. if true, apps calling navigator.requestMediaKeySystemAccess() can pass
+
−# an optional encryption scheme as part of MediaKeySystemMediaCapability
+
−# objects. If a scheme is present when we check for support, we must ensure we
+
−# support that scheme in order to provide key system access.
+
−- name: media.eme.encrypted-media-encryption-scheme.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Do we need explicit approval from the application to allow access to EME?
+
−# If true, Gecko will ask for permission before allowing MediaKeySystemAccess.
+
−# At time of writing this is aimed at GeckoView, and setting this to true
+
−# outside of GeckoView or test environments will likely break EME.
+
−- name: media.eme.require-app-approval
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.eme.audio.blank
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.eme.video.blank
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.eme.chromium-api.video-shmems
+
−  type: RelaxedAtomicUint32
+
−  value: 6
+
−  mirror: always
+
−
+
−# Is support for MediaKeys.getStatusForPolicy enabled?
+
−- name: media.eme.hdcp-policy-check.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.eme.max-throughput-ms
+
−  type: RelaxedAtomicUint32
+
−  value: 500
+
−  mirror: always
+
−
+
−- name: media.clearkey.persistent-license.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Are test specific clearkey key systems enabled and exposed?
+
−- name: media.clearkey.test-key-systems.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.cloneElementVisually.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+
−  # Whether to allow, on a Linux system that doesn't support the necessary
+
−  # sandboxing features, loading Gecko Media Plugins unsandboxed.  However, EME
+
−  # CDMs will not be loaded without sandboxing even if this pref is changed.
+
−-   name: media.gmp.insecure.allow
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−# (When reading the next line, know that preprocessor.py doesn't
+
−# understand parentheses, but && is higher precedence than ||.)
+
−#if defined(XP_WIN) && defined(_ARM64_) || defined(XP_MACOSX)
+
−  # These prefs control whether or not we will allow x86/x64 plugins
+
−  # to run on Windows ARM or Apple Silicon machines. This requires
+
−  # launching the GMP child process executable in x86/x64 mode. We
+
−  # expect to allow this for Widevine until an arm64 version of
+
−  # Widevine and Clearkey is made available. We don't expect to need
+
−  # to allow this for OpenH264.
+
−  #
+
−  # For Apple Silicon and OSX, it will be for universal builds and
+
−  # whether or not it can use the x64 Widevine plugin.
+
−  #
+
−  # For Windows ARM, it will be for ARM builds and whether or not it
+
−  # can use x86 Widevine or Clearkey plugins.
+
−
+
−  # May a Widevine GMP x64 process be executed on ARM builds.
+
−- name: media.gmp-widevinecdm.allow-x64-plugin-on-arm64
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−  # May an OpenH264 GMP x64 process be executed on ARM builds.
+
−- name: media.gmp-gmpopenh264.allow-x64-plugin-on-arm64
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−  # May a Clearkey GMP x64 process be executed on ARM builds.
+
−- name: media.gmp-gmpclearkey.allow-x64-plugin-on-arm64
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−# Specifies whether the PDMFactory can create a test decoder that just outputs
+
−# blank frames/audio instead of actually decoding. The blank decoder works on
+
−# all platforms.
+
−- name: media.use-blank-decoder
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.gpu-process-decoder
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-process.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-retryonfailure.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.rdd-process.startup_timeout_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# Specifies how many times we restart RDD process after crash till we give up.
+
−# After first RDD restart we disable HW acceleration on Linux.
+
−- name: media.rdd-process.max-crashes
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−
+
−#ifdef MOZ_FFMPEG
+
−- name: media.rdd-ffmpeg.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_FFVPX
+
−- name: media.rdd-ffvpx.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_WMF
+
−- name: media.rdd-wmf.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_APPLEMEDIA
+
−- name: media.rdd-applemedia.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−- name: media.rdd-theora.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-vorbis.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-vpx.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-wav.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-opus.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(XP_FREEBSD)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.rdd-webaudio.batch.size
+
−  type: RelaxedAtomicInt32
+
−  value: 100
+
−  mirror: always
+
−
+
−# This pref is here to control whether we want to perform audio decoding by
+
−# using the IPC actor within the Utility process rather than the RDD process.
+
−# When it is set to true, then the utility process will take precedence over RDD
+
−# to perform audio decoding.
+
−# TODO: Enabling for Isolated Processes builds on Android
+
−- name: media.utility-process.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_LINUX) && !defined(ANDROID)
+
−  value: true
+
−#elif defined(ANDROID) && !defined(MOZ_ANDROID_CONTENT_SERVICE_ISOLATED_PROCESS)
+
−  value: true
+
−#elif defined(XP_OPENBSD)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Specifies how many times we restart Utility process after crash till we give
+
−# up.
+
−- name: media.utility-process.max-crashes
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−
+
−#ifdef MOZ_FFMPEG
+
−- name: media.utility-ffmpeg.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_FFVPX
+
−- name: media.utility-ffvpx.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_WMF
+
−- name: media.utility-wmf.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_APPLEMEDIA
+
−- name: media.utility-applemedia.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−- name: media.utility-vorbis.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.utility-wav.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.utility-opus.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#ifdef ANDROID
+
−  # Enable the MediaCodec PlatformDecoderModule by default.
+
−-   name: media.android-media-codec.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Bug 1771196
+
−  # Dont yet enable AndroidDecoderModule on Utility
+
−-   name: media.utility-android-media-codec.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: media.android-media-codec.preferred
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−#endif  # ANDROID
+
−
+
−# Now we will completely disable the ability to perform audio decoding outside
+
−# of Utility.
+
−# We do that only on nightly builds for now.
+
−-   name: media.allow-audio-non-utility
+
−    type: RelaxedAtomicBool
+
−#if defined(NIGHTLY_BUILD)
+
−    value: false
+
−#else
+
−    value: true
+
−#endif // defined(NIGHTLY_BUILD)
+
−    mirror: always
+
−
+
−#ifdef MOZ_OMX
+
−-   name: media.omx.enabled
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−# Allow ffmpeg decoder to decode directly onto shmem buffer
+
−- name: media.ffmpeg.customized-buffer-allocation
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#ifdef MOZ_FFMPEG
+
−-   name: media.ffmpeg.enabled
+
−    type: RelaxedAtomicBool
+
−  #if defined(XP_MACOSX)
+
−    value: false
+
−  #else
+
−    value: true
+
−  #endif
+
−    mirror: always
+
−
+
−-   name: media.libavcodec.allow-obsolete
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif  # MOZ_FFMPEG
+
−
+
−#if defined(MOZ_FFMPEG) || defined(MOZ_FFVPX)
+
−# Allow using openh264 decoding with ffmpeg
+
−-   name: media.ffmpeg.allow-openh264
+
−    type: RelaxedAtomicBool
+
−    value: @IS_NOT_NIGHTLY_BUILD@
+
−    mirror: always
+
−#endif  # MOZ_FFMPEG || MOZ_FFVPX
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−# Use VA-API for ffmpeg video playback on Linux
+
−- name: media.ffmpeg.vaapi.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Force to copy dmabuf video frames
+
−# Used for debugging/troubleshooting only
+
−# 0 - force disable
+
−# 1 - force enable
+
−# 2 - default
+
−- name: media.ffmpeg.vaapi.force-surface-zero-copy
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: once
+
−#endif # MOZ_WIDGET_GTK
+
−
+
−-   name: media.ffvpx.enabled
+
−    type: RelaxedAtomicBool
+
−#ifdef MOZ_FFVPX
+
−    value: true
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−
+
−-   name: media.ffvpx.mp3.enabled
+
−    type: RelaxedAtomicBool
+
−#ifdef MOZ_FFVPX
+
−    value: true
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−
+
−# Set to true in marionette tests to disable the sanity test
+
−# which would lead to unnecessary start of the RDD process.
+
−-   name: media.sanity-test.disabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−#ifdef MOZ_WMF
+
−
+
−-   name: media.wmf.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether DD should consider WMF-disabled a WMF failure, useful for testing.
+
−-   name: media.decoder-doctor.wmf-disabled-is-failure
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: media.wmf.dxva.d3d11.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.dxva.max-videos
+
−    type: RelaxedAtomicUint32
+
−    value: 8
+
−    mirror: always
+
−
+
−-   name: media.wmf.dxva.d3d9.amd-pre-uvd4.disabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.use-nv12-format
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.zero-copy-nv12-textures
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−# Enable hardware decoded video no copy even when it is blocked.
+
−-   name: media.wmf.zero-copy-nv12-textures-force-enabled
+
−    type: bool
+
−    value: false
+
−    mirror: once
+
−
+
−-   name: media.wmf.force.allow-p010-format
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: media.wmf.use-sync-texture
+
−    type: bool
+
−    value: true
+
−    mirror: once
+
−
+
−-   name: media.wmf.low-latency.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.skip-blacklist
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: media.wmf.amd.highres.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.allow-unsupported-resolutions
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: media.wmf.vp9.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: media.wmf.av1.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−# Using Windows Media Foundation Media Engine for encrypted playback
+
−# 0 : disable, 1 : enable for encrypted and clear,
+
−# 2 : enable for encrypted only, 3 : enable for clear only
+
−-   name: media.wmf.media-engine.enabled
+
−    type: RelaxedAtomicUint32
+
−    value: 0
+
−    mirror: always
+
−
+
−# Testing purpose, enable media engine on channel decoder as well.
+
−-   name: media.wmf.media-engine.channel-decoder.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−# The amount of video raw data the engine stream will queue
+
−-   name: media.wmf.media-engine.raw-data-threshold.video
+
−    type: RelaxedAtomicInt32
+
−    value: 500000
+
−    mirror: always
+
−
+
−# The amount of audio raw data the engine stream will queue
+
−-   name: media.wmf.media-engine.raw-data-threshold.audio
+
−    type: RelaxedAtomicInt32
+
−    value: 2000000
+
−    mirror: always
+
−
+
−# Specifies how many times we restart MFCDM process after crash till we give up.
+
−-   name: media.wmf.media-engine.max-crashes
+
−    type: RelaxedAtomicInt32
+
−    value: 2
+
−    mirror: always
+
−
+
−# Enable PlayReady DRM for EME
+
−-   name: media.eme.playready.enabled
+
−    type: RelaxedAtomicBool
+
−#if defined(MOZ_WMF_CDM) && defined(NIGHTLY_BUILD)
+
−    value: false # TODO: enable this when ready to play.
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−
+
−#endif  # MOZ_WMF
+
−
+
−- name: media.decoder-doctor.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.hardware-video-decoding.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: media.hardware-video-decoding.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether to check the decoder supports recycling.
+
−- name: media.decoder.recycle.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Should MFR try to skip to the next key frame?
+
−- name: media.decoder.skip-to-next-key-frame.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When video continues later than the current media time for this period of
+
−# time, then it will trigger skip-to-next-keyframe mechanism. As this aims to
+
−# solve the drop frames issue where video decoding too slow for high
+
−# resolution videos. eg. 4k+. Therefore, the value is is determined by the
+
−# telemetry probe `video_inter_keyframe_max_ms` in the key of `AV,h>2160` which
+
−# shows that 95% video's key frame interval are less than ~5000. We use its
+
−# half value as a threashold to decide whether we should keep decoding in the
+
−# current video position or jump to the next keyframe in order to decode future
+
−# frames in advance.
+
−- name: media.decoder.skip_when_video_too_slow_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 2500
+
−  mirror: always
+
−
+
−# True if we want to decode in batches.
+
−- name: media.gmp.decoder.decode_batch
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# True if we allow use of any decoders found in GMP plugins.
+
−- name: media.gmp.decoder.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# True if we want to request the multithreaded GMP decoder.
+
−- name: media.gmp.decoder.multithreaded
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# True if we want to try using the GMP plugin decoders first.
+
−- name: media.gmp.decoder.preferred
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# True if we want to reorder frames from the decoder based on the timestamp.
+
−- name: media.gmp.decoder.reorder_frames
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to suspend decoding of videos in background tabs.
+
−- name: media.suspend-background-video.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Delay, in ms, from time window goes to background to suspending
+
−# video decoders. Defaults to 10 seconds.
+
−- name: media.suspend-background-video.delay-ms
+
−  type: RelaxedAtomicUint32
+
−  value: 10000
+
−  mirror: always
+
−
+
−- name: media.dormant-on-pause-timeout-ms
+
−  type: RelaxedAtomicInt32
+
−  value: 5000
+
−  mirror: always
+
−
+
−# AudioTrack and VideoTrack support
+
−- name: media.track.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref disables the reception of RTCP. It is used for testing.
+
−- name: media.webrtc.net.force_disable_rtcp_reception
+
−  type: ReleaseAcquireAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref controls whether dispatch testing-only events.
+
−- name: media.webvtt.testing.events
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.webspeech.synth.force_global_queue
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.webspeech.test.enable
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.webspeech.test.fake_fsm_events
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.webspeech.test.fake_recognition_service
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_WEBSPEECH
+
−-   name: media.webspeech.recognition.enable
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−- name: media.webspeech.recognition.force_enable
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef MOZ_WEBSPEECH
+
−-   name: media.webspeech.synth.enabled
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif  # MOZ_WEBSPEECH
+
−
+
−- name: media.encoder.webm.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.audio-max-decode-error
+
−  type: uint32_t
+
−#if defined(RELEASE_OR_BETA)
+
−  value: 3
+
−#else
+
−  # Zero tolerance in pre-release builds to detect any decoder regression.
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.video-max-decode-error
+
−  type: uint32_t
+
−#if defined(RELEASE_OR_BETA)
+
−  value: 2
+
−#else
+
−  # Zero tolerance in pre-release builds to detect any decoder regression.
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# Are video stats enabled? (Disabling can help prevent fingerprinting.)
+
−- name: media.video_stats.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# forces the number of dropped frames to 0
+
−- name: media.video.dropped_frame_stats.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Opus
+
−- name: media.opus.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Wave
+
−- name: media.wave.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Ogg
+
−- name: media.ogg.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebM
+
−- name: media.webm.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# AV1
+
−- name: media.av1.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN) && !defined(_ARM64_)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#elif defined(XP_UNIX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.av1.use-dav1d
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN) && !defined(_ARM64_)
+
−  value: true
+
−#elif defined(XP_MACOSX)
+
−  value: true
+
−#elif defined(XP_UNIX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.av1.new-thread-count-strategy
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.av1.force-thread-count
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: media.flac.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Hls
+
−- name: media.hls.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Max number of HLS players that can be created concurrently. Used only on
+
−# Android and when "media.hls.enabled" is true.
+
−#ifdef ANDROID
+
−-   name: media.hls.max-allocations
+
−    type: uint32_t
+
−    value: 20
+
−    mirror: always
+
−#endif
+
−
+
−- name: media.mp4.enabled
+
−  type: RelaxedAtomicBool
+
−#ifdef MOZ_FMP4
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.mp4.sniff_iso_brand
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Error/warning handling, Decoder Doctor.
+
−#
+
−# Set to true to force demux/decode warnings to be treated as errors.
+
−- name: media.playback.warnings-as-errors
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Resume video decoding when the cursor is hovering on a background tab to
+
−# reduce the resume latency and improve the user experience.
+
−- name: media.resume-background-video-on-tabhover
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.videocontrols.lock-video-orientation
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Media Seamless Looping
+
−- name: media.seamless-looping
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.seamless-looping-video
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.autoplay.block-event.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.media-capabilities.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.media-capabilities.screen.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.benchmark.vp9.fps
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: media.benchmark.vp9.threshold
+
−  type: RelaxedAtomicUint32
+
−  value: 150
+
−  mirror: always
+
−
+
−- name: media.benchmark.vp9.versioncheck
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: media.benchmark.frames
+
−  type: RelaxedAtomicUint32
+
−  value: 300
+
−  mirror: always
+
−
+
−- name: media.benchmark.timeout
+
−  type: RelaxedAtomicUint32
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: media.test.video-suspend
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# MediaCapture prefs follow
+
−
+
−# Enables navigator.mediaDevices and getUserMedia() support. See also
+
−# media.peerconnection.enabled
+
−- name: media.navigator.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# This pref turns off window-focus checks on the navigator.mediaDevices methods,
+
−# for partner testing frameworks.
+
−# Prefer "focusmanager.testmode", which is already set by default for
+
−# web-platform tests.
+
−- name: media.devices.unfocused.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref turns off [SecureContext] on the navigator.mediaDevices object, for
+
−# more compatible legacy behavior.
+
−- name: media.devices.insecure.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If the above pref is also enabled, this pref enabled getUserMedia() support
+
−# in http, bypassing the instant NotAllowedError you get otherwise.
+
−- name: media.getusermedia.insecure.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable tab sharing
+
−- name: media.getusermedia.browser.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# The getDisplayMedia method is always SecureContext regardless of the above two
+
−# prefs. But it is not implemented on android, and can be turned off elsewhere.
+
−- name: media.getdisplaymedia.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# The getDisplayMedia prompt uses getDisplayMedia under the hood to show previews.
+
−# This can be turned off if, e.g. on systems with known issues like X11, or if
+
−# previews are not desired.
+
−- name: media.getdisplaymedia.previews.enabled
+
−  type: bool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# Turn off any cameras (but not mics) while in the background. This is desirable
+
−# on mobile.
+
−- name: media.getusermedia.camera.background.mute.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Use the libwebrtc AVFoundation camera backend on Mac by default. When
+
−# disabled, an older forked capture module is used.
+
−- name: media.getusermedia.camera.macavf.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# This pref turns on legacy (non-spec) exposure of camera and microphone
+
−# information from enumerateDevices and devicechange ahead of successful
+
−# getUserMedia calls. Should only be turned on to resolve web compat issues,
+
−# since doing so reveals more user fingerprinting information to trackers.
+
−#
+
−# In this mode, camera and microphone device labels are exposed if the site has a
+
−# persisted permission to either kind, as well as while actively capturing either
+
−# kind (temporary and tab-specific grace-period permissions do not count).
+
−#
+
−# Planned next steps: true → @IS_NOT_NIGHTLY_BUILD@ → false
+
−- name: media.devices.enumerate.legacy.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebRTC prefs follow
+
−
+
−# Enables auto refresh of stats by default
+
−- name: media.aboutwebrtc.auto_refresh
+
−  type: bool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Enables RTCPeerConnection support. Note that, when true, this pref enables
+
−# navigator.mediaDevices and getUserMedia() support as well.
+
−# See also media.navigator.enabled
+
−- name: media.peerconnection.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.peerconnection.scripttransform.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#ifdef MOZ_WEBRTC
+
−  # Use MediaDataDecoder API for VP8/VP9 in WebRTC. This includes hardware
+
−  # acceleration for decoding.
+
−-   name: media.navigator.mediadatadecoder_vpx_enabled
+
−    type: RelaxedAtomicBool
+
−#if defined(NIGHTLY_BUILD) || defined(MOZ_WIDGET_GTK)
+
−    value: true
+
−#else
+
−    value: false
+
−#endif
+
−    mirror: always
+
−
+
−  # Use MediaDataDecoder API for H264 in WebRTC. This includes hardware
+
−  # acceleration for decoding.
+
−-   name: media.navigator.mediadatadecoder_h264_enabled
+
−    type: RelaxedAtomicBool
+
−  #if defined(_ARM64_) && defined(XP_WIN)
+
−    value: false
+
−  #else
+
−    value: true
+
−  #endif
+
−    mirror: always
+
−
+
−#if defined(MOZ_WIDGET_GTK)
+
−  # Use hardware acceleration for VP8 decoding on Linux.
+
−-   name: media.navigator.mediadatadecoder_vp8_hardware_enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−  # Interval in milliseconds at which to gather WebRTC stats for use in about:webrtc.
+
−-   name: media.aboutwebrtc.hist.poll_interval_ms
+
−    type: RelaxedAtomicUint32
+
−    value: 250
+
−    mirror: always
+
−
+
−  # History time depth in seconds to keep for webrtc:stats for use in about:webrtc.
+
−-   name: media.aboutwebrtc.hist.storage_window_s
+
−    type: RelaxedAtomicUint32
+
−    value: 60
+
−    mirror: always
+
−
+
−  # Time in minutes to retain peer connection stats after closing.
+
−-   name: media.aboutwebrtc.hist.prune_after_m
+
−    type: RelaxedAtomicUint32
+
−    value: 60 * 24 * 2
+
−    mirror: always
+
−
+
−  # Max number of closed PC stats histories to retain
+
−-   name: media.aboutwebrtc.hist.closed_stats_to_retain
+
−    type: RelaxedAtomicUint32
+
−    value: 8
+
−    mirror: always
+
−
+
−  # Gather PeerConnection stats history for display in about:webrtc. If
+
−  # disabled history will only gather when about:webrtc is open. Additionally,
+
−  # if disabled and when about:webrtc is not in the foreground history data
+
−  # will become sparse.
+
−-   name: media.aboutwebrtc.hist.enabled
+
−    type: RelaxedAtomicBool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−    value: false
+
−#else
+
−    value: @IS_NIGHTLY_BUILD@
+
−#endif
+
−    mirror: always
+
−
+
−#endif  # MOZ_WEBRTC
+
−
+
−# HTMLMediaElement.allowedToPlay should be exposed to web content when
+
−# block autoplay rides the trains to release. Until then, Nightly only.
+
−- name: media.allowed-to-play.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Is support for MediaDevices.ondevicechange enabled?
+
−- name: media.ondevicechange.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is support for HTMLMediaElement.seekToNextFrame enabled?
+
−- name: media.seekToNextFrame.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Is the Audio Output Devices API enabled?
+
−- name: media.setsinkid.enabled
+
−  type: bool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: false # bug 1473346
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Turn on this pref can enable test-only events for media element.
+
−- name: media.testing-only-events
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.useAudioChannelService.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: media.audioFocus.management
+
−  type: bool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.hardwaremediakeys.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# If this pref is on, then `media.mediacontrol.stopcontrol.timer.ms` would take
+
−# effect and determine the timing to stop controlling media.
+
−- name: media.mediacontrol.stopcontrol.timer
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# If media is being paused after a certain period, then we would think that
+
−# media doesn't need to be controlled anymore. Therefore, that media would stop
+
−# listening to the media control key events. The value of this pref is how long
+
−# media would stop listening to the event after it's paused. The default value
+
−# is set to 24 hrs (24*60*60*1000)
+
−- name: media.mediacontrol.stopcontrol.timer.ms
+
−  type: RelaxedAtomicUint32
+
−  value: 86400000
+
−  mirror: always
+
−
+
−# If this pref is on, we would stop controlling media after it reaches to the
+
−# end.
+
−- name: media.mediacontrol.stopcontrol.aftermediaends
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# We would only use media control to control media which duration is longer
+
−# than this value.
+
−- name: media.mediacontrol.eligible.media.duration.s
+
−  type: AtomicFloat
+
−  value: 3.0f
+
−  mirror: always
+
−
+
−- name: media.webrtc.platformencoder
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.webrtc.platformencoder.sw_only
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.webrtc.software_encoder.fallback
+
−  type: RelaxedAtomicBool
+
−#if !defined(MOZ_WIDGET_GTK)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−#if defined(XP_MACOSX)
+
−- name: media.webrtc.capture.allow-iosurface
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−#if defined(XP_WIN)
+
−- name: media.webrtc.capture.allow-directx
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.webrtc.capture.allow-wgc
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−#endif
+
−
+
−#if defined(MOZ_WIDGET_GTK)
+
−- name: media.webrtc.capture.allow-pipewire
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: media.webrtc.camera.allow-pipewire
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−- name: media.block-autoplay-until-in-foreground
+
−  type: bool
+
−#if !defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.webrtc.hw.h264.enabled
+
−  type: bool
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
− # If true, then we require explicit approval from the embedding app (ex. Fenix)
+
− # on GeckoView to know if we can allow audible, inaudible media or both kinds
+
− # of media to autoplay.
+
−- name: media.geckoview.autoplay.request
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
− # This is used in testing only, in order to skip the prompting process. This
+
− # pref works only when enabling the pref `media.geckoview.autoplay.request`.
+
− # 0=prompt as normal, 1=allow all, 2=deny all, 3=allow audible request,
+
− # 4=deny audible request, 5=allow inaudible request, 6=deny inaudible request.
+
− # 7=leave all requests pending.
+
−- name: media.geckoview.autoplay.request.testing
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: media.mediacontrol.testingevents.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#if defined(XP_MACOSX)
+
−- name: media.macos.screenrecording.oscheck.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# When the playback rate of an HTMLMediaElement is greater than this value, or
+
−# lower than the inverse of this value, the audio is muted.
+
−- name: media.audio.playbackrate.muting_threshold
+
−  type: uint32_t
+
−  value: 8
+
−  mirror: always
+
−
+
−# The interval of time in milliseconds between attempts to reopen any
+
−# previously unavailable audio device.
+
−- name: media.audio.device.retry.ms
+
−  type: RelaxedAtomicInt32
+
−  value: 1000
+
−  mirror: always
+
−
+
−# Time-stretch algorithm single processing sequence length in milliseconds.
+
−# This determines to how long sequences the original sound is chopped in the
+
−# time-stretch algorithm.
+
−- name: media.audio.playbackrate.soundtouch_sequence_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 10
+
−  mirror: always
+
−
+
−# Time-stretch algorithm seeking window length in milliseconds for algorithm
+
−# that finds the best possible overlapping location. This determines from how
+
−# wide window the algorithm may look for an optimal joining location when mixing
+
−# the sound sequences back together.
+
−- name: media.audio.playbackrate.soundtouch_seekwindow_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 15
+
−  mirror: always
+
−
+
−# Time-stretch algorithm overlap length in milliseconds. When the chopped sound
+
−# sequences are mixed back together, to form a continuous sound stream, this
+
−# parameter defines over how long period the two consecutive sequences are let
+
−# to overlap each other.
+
−- name: media.audio.playbackrate.soundtouch_overlap_ms
+
−  type: RelaxedAtomicInt32
+
−  value: 8
+
−  mirror: always
+
−
+
−# The duration, in milliseconds, of decoded audio to keep around in the
+
−# AudioSink ring-buffer. New decoding operations are started when this limit is
+
−# reached. The total size of the ring-buffer is slightly bigger than this.
+
−- name: media.audio.audiosink.threshold_ms
+
−  type: AtomicFloat
+
−#if defined(XP_MACOSX) && defined(MOZ_AARCH64)
+
−  value: 1000.0
+
−#else
+
−  value: 200.0
+
−#endif
+
−  mirror: always
+
−
+
−- name: media.video-wakelock
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# On Mac, enables using the `<Brand> Media Plugin Helper` executable as the
+
−# GMP child process instead of the plugin-container executable.
+
−#if defined(XP_MACOSX)
+
−-   name: media.plugin_helper_process.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "midi."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: midi.testing
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "mousewheel."
+
−#---------------------------------------------------------------------------
+
−
+
−# This affects how line scrolls from wheel events will be accelerated.
+
−# Factor to be multiplied for constant acceleration.
+
−- name: mousewheel.acceleration.factor
+
−  type: RelaxedAtomicInt32
+
−  value: 10
+
−  mirror: always
+
−
+
−# This affects how line scrolls from wheel events will be accelerated.
+
−# Number of mousewheel clicks when acceleration starts.
+
−# Acceleration can be turned off if pref is set to -1.
+
−- name: mousewheel.acceleration.start
+
−  type: RelaxedAtomicInt32
+
−  value: -1
+
−  mirror: always
+
−
+
−# Auto-dir is a feature which treats any single-wheel scroll as a scroll in the
+
−# only one scrollable direction if the target has only one scrollable
+
−# direction. For example, if the user scrolls a vertical wheel inside a target
+
−# which is horizontally scrollable but vertical unscrollable, then the vertical
+
−# scroll is converted to a horizontal scroll for that target.
+
−# Note that auto-dir only takes effect for |mousewheel.*.action|s and
+
−# |mousewheel.*.action.override_x|s whose values are 1.
+
−- name: mousewheel.autodir.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# When a wheel scroll is converted due to auto-dir, which side the converted
+
−# scroll goes towards is decided by one thing called "honoured target". If the
+
−# content of the honoured target horizontally starts from right to left, then
+
−# an upward scroll maps to a rightward scroll and a downward scroll maps to a
+
−# leftward scroll; otherwise, an upward scroll maps to a leftward scroll and a
+
−# downward scroll maps to a rightward scroll.
+
−# If this pref is set to false, then consider the scrolling target as the
+
−# honoured target.
+
−# If set to true, then consider the root element in the document where the
+
−# scrolling target is as the honoured target. But note that there's one
+
−# exception: for targets in an HTML document, the real root element(I.e. the
+
−# <html> element) is typically not considered as a root element, but the <body>
+
−# element is typically considered as a root element. If there is no <body>
+
−# element, then consider the <html> element instead.
+
−- name: mousewheel.autodir.honourroot
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: mousewheel.system_scroll_override.enabled
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Prefs for overriding the system mouse wheel scrolling speed on
+
−# content of the web pages.  When
+
−# "mousewheel.system_scroll_override.enabled" is true and the
+
−# system scrolling speed isn't customized by the user, the content scrolling
+
−# speed is multiplied by the following factors.  The value will be used as
+
−# 1/100.  E.g., 200 means 2.00.
+
−# NOTE: Even if "mousewheel.system_scroll_override.enabled" is
+
−# true, when Gecko detects the user customized the system scrolling speed
+
−# settings, the override isn't executed.
+
−- name: mousewheel.system_scroll_override.horizontal.factor
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−- name: mousewheel.system_scroll_override.vertical.factor
+
−  type: RelaxedAtomicInt32
+
−  value: 200
+
−  mirror: always
+
−
+
−# Mouse wheel scroll transaction is held even if the mouse cursor is moved.
+
−- name: mousewheel.transaction.ignoremovedelay
+
−  type: RelaxedAtomicInt32
+
−  value: 100
+
−  mirror: always
+
−
+
−# Mouse wheel scroll transaction period of time (in milliseconds).
+
−- name: mousewheel.transaction.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 1500
+
−  mirror: always
+
−
+
−# Mouse wheel scroll position is determined by GetMessagePos rather than
+
−# LPARAM msg value
+
−- name: mousewheel.ignore_cursor_position_in_lparam
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If line-height is lower than this value (in device pixels), 1 line scroll
+
−# scrolls this height.
+
−- name: mousewheel.min_line_scroll_amount
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−# Timeout period (in milliseconds) when the mouse wheel event is no longer
+
−# handled as the same series.
+
−- name: mousewheel.scroll_series_timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 80
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "mozilla."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: mozilla.widget.raise-on-setfocus
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "network."
+
−#---------------------------------------------------------------------------
+
−
+
−# Force less-secure NTLMv1 when needed (NTLMv2 is the default).
+
−- name: network.auth.force-generic-ntlm-v1
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Sub-resources HTTP-authentication:
+
−#   0 - don't allow sub-resources to open HTTP authentication credentials
+
−#       dialogs
+
−#   1 - allow sub-resources to open HTTP authentication credentials dialogs,
+
−#       but don't allow it for cross-origin sub-resources
+
−#   2 - allow the cross-origin authentication as well.
+
−- name: network.auth.subresource-http-auth-allow
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Sub-resources HTTP-authentication for cross-origin images:
+
−# - true: It is allowed to present http auth. dialog for cross-origin images.
+
−# - false: It is not allowed.
+
−# If network.auth.subresource-http-auth-allow has values 0 or 1 this pref does
+
−# not have any effect.
+
−- name: network.auth.subresource-img-cross-origin-http-auth-allow
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Resources that are triggered by some non-web-content:
+
−# - true: They are allow to present http auth. dialog
+
−# - false: They are not allow to present http auth. dialog.
+
−- name: network.auth.non-web-content-triggered-resources-http-auth-allow
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to show anti-spoof confirmation prompts when navigating to a url
+
−# with userinfo
+
−- name: network.auth.confirmAuth.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to display auth prompts if X-Frame-Options header will block loading
+
−# page
+
−- name: network.auth.supress_auth_prompt_for_XFO_failures
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use new implementation of ParseReasm
+
−- name: network.auth.use_new_parse_realm
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use new implementation of ParseReasm
+
−- name: network.auth.allow_multiple_challenges_same_line
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use challenges in the most secure order. See bug 650091.
+
−- name: network.auth.choose_most_secure_challenge
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to allow truncated brotli with empty output. This also fixes
+
−# throwing an erroring when receiving highly compressed brotli files when
+
−# no content type is specified (Bug 1715401). This pref can be removed after
+
−# some time (Bug 1841061)
+
−- name: network.compress.allow_truncated_empty_brotli
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# See the full list of values in nsICookieService.idl.
+
−- name: network.cookie.cookieBehavior
+
−  type: RelaxedAtomicInt32
+
−  value: 0 # accept all cookies
+
−  mirror: always
+
−
+
−# See the full list of values in nsICookieService.idl.
+
−- name: network.cookie.rejectForeignWithExceptions.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# The cookieBehavior to be used in Private Browsing mode.
+
−- name: network.cookie.cookieBehavior.pbmode
+
−  type: RelaxedAtomicInt32
+
−  value: 0 # accept all cookies
+
−  mirror: always
+
−
+
−# Stale threshold for cookies in seconds.
+
−- name: network.cookie.staleThreshold
+
−  type: uint32_t
+
−  value: 60
+
−  mirror: always
+
−
+
−- name: network.cookie.sameSite.laxByDefault
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# lax-by-default 2 minutes tollerance for unsafe methods. The value is in seconds.
+
−- name: network.cookie.sameSite.laxPlusPOST.timeout
+
−  type: uint32_t
+
−  value: 120
+
−  mirror: always
+
−
+
−# For lax-by-default cookies ignore cross-site redirects when the final
+
−# redirect is same-site again.
+
−# https://github.com/httpwg/http-extensions/issues/2104
+
−- name: network.cookie.sameSite.laxByDefault.allowBoomerangRedirect
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.cookie.sameSite.noneRequiresSecure
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−- name: network.cookie.sameSite.schemeful
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.cookie.thirdparty.sessionOnly
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.cookie.thirdparty.nonsecureSessionOnly
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If we should not store "persistent" cookies at all, i.e., make the
+
−# "persistent" storage be like "private" storage.  This value is only read when
+
−# instantiating persistent storage for the cookie service, which usually only
+
−# happens when the cookie service singleton is created.
+
−- name: network.cookie.noPersistentStorage
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true then any cookies containing unicode will be rejected
+
−- name: network.cookie.blockUnicode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true cookies loaded from the sqlite DB that have a creation or
+
−# last accessed time that is in the future will be fixed and the
+
−# timestamps will be set to the current time.
+
−- name: network.cookie.fixup_on_db_load
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If we should attempt to race the cache and network.
+
−- name: network.http.rcwn.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.rcwn.cache_queue_normal_threshold
+
−  type: uint32_t
+
−  value: 8
+
−  mirror: always
+
−
+
−- name: network.http.rcwn.cache_queue_priority_threshold
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# We might attempt to race the cache with the network only if a resource
+
−# is smaller than this size.
+
−- name: network.http.rcwn.small_resource_size_kb
+
−  type: uint32_t
+
−  value: 256
+
−  mirror: always
+
−
+
−- name: network.http.rcwn.min_wait_before_racing_ms
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: network.http.rcwn.max_wait_before_racing_ms
+
−  type: uint32_t
+
−  value: 500
+
−  mirror: always
+
−
+
−# false=real referer, true=spoof referer (use target URI as referer).
+
−- name: network.http.referer.spoofSource
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Check whether we need to hide referrer when leaving a .onion domain.
+
−# false=allow onion referer, true=hide onion referer (use empty referer).
+
−- name: network.http.referer.hideOnionSource
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Include an origin header on non-GET and non-HEAD requests regardless of CORS.
+
−# 0=never send, 1=send when same-origin only, 2=always send.
+
−- name: network.http.sendOriginHeader
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to respect the redirected-tainted origin flag
+
−# https://fetch.spec.whatwg.org/#concept-request-tainted-origin
+
−- name: network.http.origin.redirectTainted
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to strip auth headers for redirected fetch/xhr channels
+
−# https://fetch.spec.whatwg.org/#http-redirect-fetch
+
−- name: network.fetch.redirect.stripAuthHeader
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to strip auth headers for redirected http channels
+
−# https://fetch.spec.whatwg.org/#http-redirect-fetch
+
−- name: network.http.redirect.stripAuthHeader
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Prefs allowing granular control of referers.
+
−# 0=don't send any, 1=send only on clicks, 2=send on image requests as well
+
−- name: network.http.sendRefererHeader
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# The maximum allowed length for a referrer header - 4096 default.
+
−# 0 means no limit.
+
−- name: network.http.referer.referrerLengthLimit
+
−  type: uint32_t
+
−  value: 4096
+
−  mirror: always
+
−
+
−#  0=always send, 1=send iff base domains match, 2=send iff hosts match.
+
−- name: network.http.referer.XOriginPolicy
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# 0=full URI, 1=scheme+host+port+path, 2=scheme+host+port.
+
−- name: network.http.referer.trimmingPolicy
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# 0=full URI, 1=scheme+host+port+path, 2=scheme+host+port.
+
−- name: network.http.referer.XOriginTrimmingPolicy
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# Set the default Referrer Policy; to be used unless overriden by the site.
+
−# 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin,
+
−# 3=no-referrer-when-downgrade.
+
−- name: network.http.referer.defaultPolicy
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Set the default Referrer Policy applied to third-party trackers when the
+
−# default cookie policy is set to reject third-party trackers, to be used
+
−# unless overriden by the site.
+
−# 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin,
+
−# 3=no-referrer-when-downgrade.
+
−# Trim referrers from trackers to origins by default.
+
−- name: network.http.referer.defaultPolicy.trackers
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Set the Private Browsing Default Referrer Policy, to be used
+
−# unless overriden by the site.
+
−# 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin,
+
−# 3=no-referrer-when-downgrade.
+
−- name: network.http.referer.defaultPolicy.pbmode
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Set to ignore referrer policies which is less restricted than the default for
+
−# cross-site requests, including 'unsafe-url', 'no-referrer-when-downgrade' and
+
−# 'origin-when-cross-origin'.
+
−- name: network.http.referer.disallowCrossSiteRelaxingDefault
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we ignore less restricted referrer policies for top navigations.
+
−- name: network.http.referer.disallowCrossSiteRelaxingDefault.top_navigation
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−
+
−# Set to ignore referrer policies which is less restricted than the default for
+
−# cross-site requests in the private browsing mode, including 'unsafe-url',
+
−# 'no-referrer-when-downgrade' and 'origin-when-cross-origin'.
+
−- name: network.http.referer.disallowCrossSiteRelaxingDefault.pbmode
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we ignore less restricted referrer policies for top navigations in the
+
−# private browsing mode.
+
−- name: network.http.referer.disallowCrossSiteRelaxingDefault.pbmode.top_navigation
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Set the Private Browsing Default Referrer Policy applied to third-party
+
−# trackers when the default cookie policy is set to reject third-party
+
−# trackers, to be used unless overriden by the site.
+
−# 0=no-referrer, 1=same-origin, 2=strict-origin-when-cross-origin,
+
−# 3=no-referrer-when-downgrade.
+
−# No need to change this pref for trimming referrers from trackers since in
+
−# private windows we already trim all referrers to origin only.
+
−- name: network.http.referer.defaultPolicy.trackers.pbmode
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether certain http header values should be censored out in logs.
+
−# Specifically filters out "authorization" and "proxy-authorization".
+
−- name: network.http.sanitize-headers-in-logs
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Set this pref to an integer like 99 to override the User-Agent string's
+
−# 'rv' bit. The value 0 means use the default Firefox version. We introduced
+
−# this for Firefox 110 because it turned out websites used user agent parsing
+
−# for "rv:11" to detect IE11.
+
−- name: network.http.useragent.forceRVOnly
+
−  type: uint32_t
+
−  value: 109
+
−  mirror: always
+
−
+
−# Whether or not we use Windows for SSO to Microsoft sites.
+
−- name: network.http.windows-sso.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether windows-sso is enabled for the default (0) container.
+
−# To enable SSO for additional containers, add a new pref like
+
−# `network.http.windows-sso.container-enabled.${containerId}` = true
+
−- name: network.http.windows-sso.container-enabled.0
+
−  type: bool
+
−  value: true
+
−  mirror: never
+
−
+
−# The factor by which to increase the keepalive timeout when the
+
−# NS_HTTP_LARGE_KEEPALIVE flag is used for a connection
+
−- name: network.http.largeKeepaliveFactor
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# This preference, if true, causes all UTF-8 domain names to be normalized to
+
−# punycode.  The intention is to allow UTF-8 domain names as input, but never
+
−# generate them from punycode.
+
−- name: network.IDN_show_punycode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If set to true, IOService.offline depends on IOService.connectivity.
+
−- name: network.offline-mirrors-connectivity
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If set to true, disallow localhost connections when offline.
+
−- name: network.disable-localhost-when-offline
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables the predictive service.
+
−- name: network.predictor.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Set true to allow resolving proxy for localhost
+
−- name: network.proxy.allow_hijacking_localhost
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref will still treat localhost URLs as secure even when hijacked
+
−# during testing. This is necessary for automated testing to check that we
+
−# actually treat localhost as a secure origin.
+
−- name: network.proxy.testing_localhost_is_secure_when_hijacked
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allow CookieJarSettings to be unblocked for channels without a document.
+
−# This is for testing only.
+
−- name: network.cookieJarSettings.unblocked_for_testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.predictor.enable-hover-on-ssl
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.predictor.enable-prefetch
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−- name: network.predictor.page-degradation.day
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−- name: network.predictor.page-degradation.week
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−- name: network.predictor.page-degradation.month
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−- name: network.predictor.page-degradation.year
+
−  type: int32_t
+
−  value: 25
+
−  mirror: always
+
−- name: network.predictor.page-degradation.max
+
−  type: int32_t
+
−  value: 50
+
−  mirror: always
+
−
+
−- name: network.predictor.subresource-degradation.day
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−- name: network.predictor.subresource-degradation.week
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−- name: network.predictor.subresource-degradation.month
+
−  type: int32_t
+
−  value: 25
+
−  mirror: always
+
−- name: network.predictor.subresource-degradation.year
+
−  type: int32_t
+
−  value: 50
+
−  mirror: always
+
−- name: network.predictor.subresource-degradation.max
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: network.predictor.prefetch-rolling-load-count
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−- name: network.predictor.prefetch-min-confidence
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always
+
−- name: network.predictor.preconnect-min-confidence
+
−  type: int32_t
+
−  value: 90
+
−  mirror: always
+
−- name: network.predictor.preresolve-min-confidence
+
−  type: int32_t
+
−  value: 60
+
−  mirror: always
+
−
+
−- name: network.predictor.prefetch-force-valid-for
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−- name: network.predictor.max-resources-per-entry
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# This is selected in concert with max-resources-per-entry to keep memory
+
−# usage low-ish. The default of the combo of the two is ~50k.
+
−- name: network.predictor.max-uri-length
+
−  type: uint32_t
+
−  value: 500
+
−  mirror: always
+
−
+
−# A testing flag.
+
−- name: network.predictor.doing-tests
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables `<link rel="preload">` tag and `Link: rel=preload` response header
+
−# handling.
+
−- name: network.preload
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables `<link rel="preconnect">` tag and `Link: rel=preconnect` response header
+
−# handling.
+
−- name: network.preconnect
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables `<link rel="modulepreload">` tag and `Link: rel=modulepreload`
+
−# response header handling.
+
−- name: network.modulepreload
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable 103 Early Hint status code (RFC 8297)
+
−- name: network.early-hints.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Enable `Link: rel=preconnect` in 103 Early Hint response.
+
−- name: network.early-hints.preconnect.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# The max number of speculative connections we allow for `Link: rel=preconnect`.
+
−# When 0, the speculative connection created due to `Link: rel=preconnect` will
+
−# be limited by "network.http.speculative-parallel-limit".
+
−- name: network.early-hints.preconnect.max_connections
+
−  type: uint32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−# How long we should wait for EarlyHintPreloader to be used.
+
−# Under normal circumstances it should be used immidiately.
+
−- name: network.early-hints.parent-connect-timeout
+
−  type: uint32_t
+
−  value: 10000
+
−  mirror: always
+
−
+
−# Whether to use the network process or not
+
−# Start a separate socket process. Performing networking on the socket process
+
−# is control by a sepparate pref
+
−# ("network.http.network_access_on_socket_process.enabled").
+
−# Changing these prefs requires a restart.
+
−- name: network.process.enabled
+
−  type: RelaxedAtomicBool
+
−  mirror: always
+
−#if defined(ANDROID) || defined(MOZ_THUNDERBIRD)
+
−  value: false # see bug 1641427
+
−#else
+
−  value: true
+
−#endif
+
−
+
−# Whether we can send OnDataAvailable to content process directly.
+
−- name: network.send_ODA_to_content_directly
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Perform all network access on the socket process.
+
−# The pref requires "network.process.enabled" to be true.
+
−# Changing these prefs requires a restart.
+
−- name: network.http.network_access_on_socket_process.enabled
+
−  type: RelaxedAtomicBool
+
−  mirror: always
+
−  value: false
+
−
+
−# Telemetry of traffic categories. Whether or not to enable HttpTrafficAnalyzer.
+
−- name: network.traffic_analyzer.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether DNS resolution is limited to literals and cached entries.
+
−- name: network.dns.disabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether DNS resolution is limited to literals and cached entries.
+
−- name: network.dns.skipTRR-when-parental-control-enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.dns.disablePrefetchFromHTTPS
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Max time to shutdown the resolver threads
+
−- name: network.dns.resolver_shutdown_timeout_ms
+
−  type: uint32_t
+
−  value: 2000
+
−  mirror: always
+
−
+
−# When true on Windows DNS resolutions for single label domains
+
−# (domains that don't contain a dot) will be resolved using the DnsQuery
+
−# API instead of PR_GetAddrInfoByName
+
−- name: network.dns.dns_query_single_label
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When this pref is true we enforce a 253 character limit on domains we try to
+
−# resolve. See bug 1264117. If it doesn't cause any web-compat issues we can
+
−# remove it in a few releases
+
−- name: network.dns.limit_253_chars
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is true, we copy the host name to a fresh string before
+
−# calling into getaddrinfo.
+
−- name: network.dns.copy_string_before_call
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.dns.max_high_priority_threads
+
−  type: RelaxedAtomicUint32
+
−  value: 5
+
−  mirror: always
+
−
+
−- name: network.dns.max_any_priority_threads
+
−  type: RelaxedAtomicUint32
+
−  value: 3
+
−  mirror: always
+
−
+
−# The proxy type. See nsIProtocolProxyService.idl
+
−#     PROXYCONFIG_DIRECT   = 0
+
−#     PROXYCONFIG_MANUAL   = 1
+
−#     PROXYCONFIG_PAC      = 2
+
−#     PROXYCONFIG_WPAD     = 4
+
−#     PROXYCONFIG_SYSTEM   = 5
+
−- name: network.proxy.type
+
−  type: RelaxedAtomicUint32
+
−  value: 5
+
−  mirror: always
+
−
+
−# Whether the SOCKS proxy should be in charge of DNS resolution.
+
−- name: network.proxy.socks_remote_dns
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When receiving a network change event, the time (in ms) we wait to reload the
+
−# PAC url.
+
−- name: network.proxy.reload_pac_delay
+
−  type: RelaxedAtomicUint32
+
−  value: 2000
+
−  mirror: always
+
−
+
−# When parsing "SOCKS" in PAC string, the default version of SOCKS that will be
+
−# used.
+
−- name: network.proxy.default_pac_script_socks_version
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−# Whether to force failover to direct for system requests.
+
−#ifdef MOZ_PROXY_DIRECT_FAILOVER
+
−- name: network.proxy.failover_direct
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# Whether to allow a bypass flag to be set on httpChannel that will
+
−# prevent proxies from being used for that specific request.
+
−- name: network.proxy.allow_bypass
+
−  type: bool
+
−#ifdef MOZ_PROXY_BYPASS_PROTECTION
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−- name: network.proxy.parse_pac_on_socket_process
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.proxy.detect_system_proxy_changes
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If all non-direct proxies have failed, we retry all of them in case they
+
−# are online now.
+
−- name: network.proxy.retry_failed_proxies
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Some requests during a page load are marked as "tail", mainly trackers, but not only.
+
−# This pref controls whether such requests are put to the tail, behind other requests
+
−# emerging during page loading process.
+
−- name: network.http.tailing.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to run proxy checks when processing Alt-Svc headers.
+
−- name: network.http.altsvc.proxy_checks
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.stale_while_revalidate.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Capacity of the above cache, in kilobytes.
+
−- name: network.ssl_tokens_cache_capacity
+
−  type: RelaxedAtomicUint32
+
−  value: 2048
+
−  mirror: always
+
−
+
−# How many records we store per entry
+
−- name: network.ssl_tokens_cache_records_per_entry
+
−  type: RelaxedAtomicUint32
+
−  value: 2
+
−  mirror: always
+
−
+
−# If true, only use the token once
+
−- name: network.ssl_tokens_cache_use_only_once
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum allowed length for a URL - 1MB default.
+
−- name: network.standard-url.max-length
+
−  type: RelaxedAtomicUint32
+
−  value: 1048576
+
−  mirror: always
+
−
+
−# DNS Trusted Recursive Resolver
+
−# 0 - default off, 1 - reserved/off, 2 - TRR first, 3 - TRR only,
+
−# 4 - reserved/off, 5 off by choice
+
−- name: network.trr.mode
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Default global TRR provider
+
−- name: network.trr.default_provider_uri
+
−  type: String
+
−  value: "https://mozilla.cloudflare-dns.com/dns-query"
+
−  mirror: never
+
−
+
−# If true, retry TRR for recoverable errors once.
+
−- name: network.trr.retry_on_recoverable_errors
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If true, don't fallback to native DNS upon network errors.
+
−- name: network.trr.strict_native_fallback
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true, we'll fallback to native if the retry also times out.
+
−- name: network.trr.strict_native_fallback_allow_timeouts
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Single TRR request timeout (ms) when strict native fallback is enabled.
+
−- name: network.trr.strict_fallback_request_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 6000
+
−  mirror: always
+
−
+
−# If false, the temporary blocklisting feature is disabled.
+
−# This is useful for tests to prevent bleeding extra reqs
+
−# between tasks, since we may attempt to look up the
+
−# parent domain in the background when blocklisting a host.
+
−- name: network.trr.temp_blocklist
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# TRR blocklist entry expire time (in seconds). Default is one minute.
+
−# Meant to survive basically a page load.
+
−- name: network.trr.temp_blocklist_duration_sec
+
−  type: RelaxedAtomicUint32
+
−  value: 60
+
−  mirror: always
+
−
+
−# Single TRR request timeout, in milliseconds
+
−- name: network.trr.request_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 1500
+
−  mirror: always
+
−
+
−# Single TRR request timeout, in milliseconds for mode 3
+
−- name: network.trr.request_timeout_mode_trronly_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 30000
+
−  mirror: always
+
−
+
−# Similar to network.http.http2.ping-timeout, but this is used when the
+
−# Http/2 connection is connected to the TRR server.
+
−- name: network.trr.ping_timeout
+
−  type: RelaxedAtomicUint32
+
−  value: 3000
+
−  mirror: always
+
−
+
−# The timeout of the TRR confirmation request
+
−- name: network.trr.confirmation_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 6000
+
−  mirror: always
+
−
+
−# The timeout of the TRR confirmation request
+
−- name: network.trr.confirmation_telemetry_enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to send the Accept-Language header for TRR requests
+
−- name: network.trr.send_accept-language_headers
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to send an empty Accept-Encoding header for TRR requests
+
−- name: network.trr.send_empty_accept-encoding_headers
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to send the User-Agent header for TRR requests
+
−- name: network.trr.send_user-agent_headers
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref controls whether to use TRRServiceChannel off main thread.
+
−- name: network.trr.fetch_off_main_thread
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If we should wait for captive portal confirmation before enabling TRR
+
−- name: network.trr.wait-for-portal
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If we should wait for TRR service confirmation to complete before enabling
+
−# TRR for lookups when fallback is enabled. Confirmation is always skipped when
+
−# global mode is TRR-only (no fallback).
+
−- name: network.trr.wait-for-confirmation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Normally when confirmation fails we wait for the confirmation to succeed
+
−# before attempting to do TRR. When this pref is true, we optimistically
+
−# assume the confirmation will succeed and might attempt TRR anyway.
+
−# If network.trr.wait-for-confirmation is true, this pref is ignored.
+
−- name: network.trr.attempt-when-retrying-confirmation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Use GET (rather than POST)
+
−- name: network.trr.useGET
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allow RFC1918 address in responses?
+
−- name: network.trr.allow-rfc1918
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When true, it only sends AAAA when the system has IPv6 connectivity
+
−- name: network.trr.skip-AAAA-when-not-supported
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to apply split horizon mitigations when using TRR.
+
−# These include adding the DNS suffix to the excluded domains
+
−- name: network.trr.split_horizon_mitigations
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Explicitly disable ECS (EDNS Client Subnet, RFC 7871)
+
−- name: network.trr.disable-ECS
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When true, the DNS+TRR cache will be cleared when a relevant TRR pref
+
−# changes. (uri, bootstrapAddress, excluded-domains)
+
−- name: network.trr.clear-cache-on-pref-change
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# After this many failed TRR requests in a row, consider TRR borked
+
−- name: network.trr.max-fails
+
−  type: RelaxedAtomicUint32
+
−  value: 15
+
−  mirror: always
+
−
+
−# When the TRR confirmation is set to CONFIRM_FAILED due to many failures in
+
−# a row, we set a timer to retry. This has an exponential backoff up to
+
−# 64 seconds.
+
−- name: network.trr.retry-timeout-ms
+
−  type: RelaxedAtomicUint32
+
−  value: 125
+
−  mirror: always
+
−
+
−# Retry with no TRR when the response contained only 0.0.0.0 or ::
+
−- name: network.trr.fallback-on-zero-response
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true we parse the /etc/hosts file and exclude any host names from TRR.
+
−# Reading the file is only done once, when TRR is first enabled - this could be
+
−# soon after startup or when the pref is flipped.
+
−- name: network.trr.exclude-etc-hosts
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to add padding in the doh dns queries (rfc 7830)
+
−- name: network.trr.padding
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The block size to pad to. Capped at 1024 bytes.
+
−# Setting it to 0 doesn't add additional padding, but allows the server to
+
−# respond with padding (RFC7930 Sec 4)
+
−- name: network.trr.padding.length
+
−  type: RelaxedAtomicUint32
+
−  value: 128
+
−  mirror: always
+
−
+
−# Whether to skip the NS check for the blocked host.
+
−# Note this is used for test only.
+
−- name: network.trr.skip-check-for-blocked-host
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to use the connection info that is generated asynchronously.
+
−- name: network.trr.async_connInfo
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# The base URL of the `Learn more` button for skip reasons
+
−- name: network.trr_ui.skip_reason_learn_more_url
+
−  type: String
+
−  value: "https://firefox-source-docs.mozilla.org/networking/dns/trr-skip-reasons.html#"
+
−  mirror: never
+
−
+
−# If true, display a warning before fallback to native
+
−- name: network.trr.display_fallback_warning
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Heuristics in this list will trigger the fallback to native warning
+
−- name: network.trr.fallback_warning_heuristic_list
+
−  type: String
+
−  value: "canary"
+
−  mirror: never
+
−
+
−# Use Oblivious HTTP when making TRR requests.
+
−- name: network.trr.use_ohttp
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Oblivious HTTP relay URI for TRR requests.
+
−- name: network.trr.ohttp.relay_uri
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# URI from which to fetch the configuration for the Oblivious HTTP gateway for TRR requests.
+
−- name: network.trr.ohttp.config_uri
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# The URI used for the target DoH server when network.trr.use_ohttp is true
+
−- name: network.trr.ohttp.uri
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# Allow the network changed event to get sent when a network topology or setup
+
−# change is noticed while running.
+
−- name: network.notify.changed
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Allow network detection of IPv6 related changes (bug 1245059)
+
−- name: network.notify.IPv6
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_WIN
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to check the dnsSuffix on network changes
+
−- name: network.notify.dnsSuffixList
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to check the registry for proxies on network changes that indicate
+
−# that TRR should not be used.
+
−- name: network.notify.checkForProxies
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to check the registry for NRPT rules on network changes that
+
−# indicate that TRR should not be used.
+
−- name: network.notify.checkForNRPT
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether NotifyIpInterfaceChange should be called immediately after
+
−# registration in order to record the initial state of the network adapters.
+
−- name: network.notify.initial_call
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to check for DNS resolvers
+
−- name: network.notify.resolvers
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use the rust implemented DefaultURI for unknown scheme types
+
−- name: network.url.useDefaultURI
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# The maximum allowed length for a URL - 32MB default.
+
−# If 0 that means no limit.
+
−- name: network.url.max-length
+
−  type: RelaxedAtomicUint32
+
−  value: 32 * 1024 * 1024
+
−  mirror: always
+
−
+
−# Should be removed if no breakage occurs. See bug 1797846
+
−- name: network.url.strip-data-url-whitespace
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Force remapping of remote port numbers to allow reaching local testing
+
−# servers or port forwarders listening on non-standard ports.  Note that
+
−# this is not changing the origin URL in the addressbar, only internally
+
−# the port number used.  This is intended to be used along with the
+
−# `network.dns.forceResolve` preference.
+
−#
+
−# The form is:
+
−#   "80,443,808-888=8080; 563=8081"
+
−# this will remap ports for HTTP, HTTPS and the range of 808-888 included
+
−# to use port 8080, and port 563 to go to 8081.
+
−- name: network.socket.forcePort
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# Try and use HTTP2 when using SSL
+
−- name: network.http.http2.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.enabled.deps
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.enforce-tls-profile
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.chunk-size
+
−  type: RelaxedAtomicInt32
+
−  value: 16000
+
−  mirror: always
+
−
+
−- name: network.http.http2.timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 170
+
−  mirror: always
+
−
+
−- name: network.http.http2.coalesce-hostnames
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.ping-threshold
+
−  type: RelaxedAtomicInt32
+
−  value: 58
+
−  mirror: always
+
−
+
−- name: network.http.http2.ping-timeout
+
−  type: RelaxedAtomicInt32
+
−  value: 8
+
−  mirror: always
+
−
+
−- name: network.http.http2.send-buffer-size
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: network.http.http2.allow-push
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.push-allowance
+
−  type: RelaxedAtomicInt32
+
−  value: 131072  # 128KB
+
−  mirror: always
+
−
+
−- name: network.http.http2.pull-allowance
+
−  type: RelaxedAtomicInt32
+
−  value: 12582912  # 12MB
+
−  mirror: always
+
−
+
−- name: network.http.http2.default-concurrent
+
−  type: RelaxedAtomicInt32
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: network.http.http2.default-hpack-buffer
+
−  type: RelaxedAtomicInt32
+
−  value: 65536 # 64K
+
−  mirror: always
+
−
+
−- name: network.http.http2.websockets
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: network.http.http2.enable-hpack-dump
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable HTTP/3
+
−- name: network.http.http3.enable
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Receive buffer size of QUIC socket
+
−- name: network.http.http3.recvBufferSize
+
−  type: RelaxedAtomicInt32
+
−  value: 1048576
+
−  mirror: always
+
−
+
−- name: network.http.http3.enable_qlog
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.http.http3.enable_0rtt
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When a h3 transaction is inserted in the pending queue, the time (ms) we wait
+
−# to create a TCP backup connection.
+
−- name: network.http.http3.backup_timer_delay
+
−  type: RelaxedAtomicUint32
+
−  value: 100
+
−  mirror: always
+
−
+
−# The global half open sockets allowed for creating a backup connection.
+
−- name: network.http.http3.parallel_fallback_conn_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 32
+
−  mirror: always
+
−
+
−# Receive buffer size of QUIC socket
+
−- name: network.http.http3.max_data
+
−  type: RelaxedAtomicUint32
+
−  value: 25165824
+
−  mirror: always
+
−
+
−# Receive buffer size of QUIC socket
+
−- name: network.http.http3.max_stream_data
+
−  type: RelaxedAtomicUint32
+
−  value: 12582912
+
−  mirror: always
+
−
+
−# Enable http3 network priority as described in
+
−# https://httpwg.org/http-extensions/draft-ietf-httpbis-priority.html
+
−- name: network.http.http3.priority
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Depriorizing background tabs notifies websites when switching to or from the
+
−# tab while still loading resources for the website. On one hand it might
+
−# improve performance when switching to an tab with a website using the same
+
−# QUIC connection. On the other hand it sends more data to the website and
+
−# might be a privacy concern.
+
−- name: network.http.http3.send_background_tabs_deprioritization
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.http.http3.version_negotiation.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When a Http/3 connection failed, whether to retry with a different IP address.
+
−- name: network.http.http3.retry_different_ip_family
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# This is for testing purpose. When true, nsUDPSocket::SendWithAddress will
+
−# return NS_ERROR_CONNECTION_REFUSED for address "::1".
+
−- name: network.http.http3.block_loopback_ipv6_addr
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When true, a http request will be upgraded to https when HTTPS RR is
+
−# available.
+
−- name: network.dns.upgrade_with_https_rr
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to use HTTPS RR as AltSvc
+
−- name: network.dns.use_https_rr_as_altsvc
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether to check for NAT64 using the system resolver
+
−- name: network.connectivity-service.nat64-check
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Manually enter the NAT64 prefix that will be used if IPv4 is unavailable.
+
−# The value is formatted as IPv6 with the least significant bits to be dropped.
+
−# For example, 64:ff9b:: is a common prefix. This will not disable
+
−# the NAT64 check, although the value of this pref will be prioritized.
+
−- name: network.connectivity-service.nat64-prefix
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# Whether to enable echconfig.
+
−- name: network.dns.echconfig.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to enable echconfig for http3.
+
−- name: network.dns.http3_echconfig.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# This pref needs to be worked together with network.dns.echconfig.enabled
+
−# being true and there is no record without ECHConfig.
+
−# When we try all records with ECHConfig in HTTPS RRs and still can't connect,
+
−# this pref indicate whether we can fallback to the origin server.
+
−- name: network.dns.echconfig.fallback_to_origin_when_all_failed
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# When true, reset the exclusion list when all records are excluded.
+
−- name: network.dns.httpssvc.reset_exclustion_list
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If the http3 connection cannot be ready after the timeout value here, the
+
−# transaction will start another non-http3 conneciton.
+
−# Setting this value to 0 indicates this feature is disabled.
+
−- name: network.dns.httpssvc.http3_fast_fallback_timeout
+
−  type: RelaxedAtomicUint32
+
−  value: 50
+
−  mirror: always
+
−
+
−# Whether to force a transaction to wait https rr.
+
−- name: network.dns.force_waiting_https_rr
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# The TTL for negative responses of TXT and HTTPS records.
+
−- name: network.dns.negative_ttl_for_type_record
+
−  type: RelaxedAtomicUint32
+
−  value: 300   # 5 minutes (in seconds)
+
−  mirror: always
+
−
+
−# Whether to use port prefixed QNAME for HTTPS RR
+
−- name: network.dns.port_prefixed_qname_https_rr
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to use HTTPS RR and ignore NS_HTTP_DISALLOW_HTTPS_RR
+
−# This pref is only set when running tests
+
−- name: network.dns.force_use_https_rr
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This preference can be used to turn off IPv6 name lookups. See bug 68796.
+
−- name: network.dns.disableIPv6
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to add additional record IPs to the cache
+
−- name: network.trr.add_additional_records
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is true, AddStorageEntry will return an error if the
+
−# OPEN_READONLY & OPEN_SECRETLY flags are passed and no entry exists.
+
−# If no regressions occur this pref should be removed.
+
−- name: network.cache.bug1708673
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# When true we will dispatch a background task (separate process) to
+
−# delete the cache folder at shutdown in order to avoid shutdown hangs.
+
−- name: network.cache.shutdown_purge_in_background_task
+
−  type: RelaxedAtomicBool
+
−#if defined(XP_WIN)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Number of seconds to wait for the cache folder to be renamed before
+
−# the background task forcefully exists.
+
−- name: network.cache.shutdown_purge_folder_wait_seconds
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# This is used for a temporary workaround for a web-compat issue. If pref is
+
−# true CORS preflight requests are allowed to send client certificates.
+
−- name: network.cors_preflight.allow_client_cert
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If true nsCORSListenerProxy will reject any URL that contains user & password
+
−# regardless if it's a redirect or not. When false nsCORSListenerProxy will
+
−# only reject URLs with a username and password when they happen on a redirected
+
−# channel.
+
−- name: network.cors_preflight.block_userpass_uri
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to record the telemetry event when a JAR channel is failed to load.
+
−- name: network.jar.record_failure_reason
+
−  type: RelaxedAtomicBool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# nsJARInputStream::Available returns the size indicated by the archived entry
+
−# so we need a limit so we don't OOM if the archive is corrupted.
+
−- name: network.jar.max_available_size
+
−  type: RelaxedAtomicUint32
+
−  value: 256*1024*1024 # 256 Mb
+
−  mirror: always
+
−
+
−# Whether JAR entries that defate to a different size than RealSize/orglen
+
−# are considered corrupted or not
+
−- name: network.jar.require_size_match
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# When this pref is true, we will use the HTTPS acceptable content encoding
+
−# list for trustworthy domains such as http://localhost
+
−- name: network.http.encoding.trustworthy_is_https
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Support http3 version1
+
−- name: network.http.http3.support_version1
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disable early data on an origin if SSL_ERROR_PROTOCOL_VERSION_ALERT is received
+
−- name: network.http.early_data_disable_on_error
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disable early data if it fails for more than this number of origins
+
−- name: network.http.early_data_max_error
+
−  type: RelaxedAtomicUint32
+
−  value: 5
+
−  mirror: always
+
−
+
−  # If true, remove the resumption token when 0RTT failed.
+
−- name: network.http.remove_resumption_token_when_early_data_failed
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum count that we allow socket prrocess to crash. If this count is
+
−# reached, we won't use networking over socket process.
+
−- name: network.max_socket_process_failed_count
+
−  type: RelaxedAtomicUint32
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: network.allow_redirect_to_data
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: network.allow_raw_sockets_in_content_processes
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: network.allow_large_stack_size_for_socket_thread
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebTransport
+
−- name: network.webtransport.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebTransport Datagram support
+
−- name: network.webtransport.datagrams.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebTransport Datagram size
+
−- name: network.webtransport.datagram_size
+
−  type: RelaxedAtomicUint32
+
−  value: 1200
+
−  mirror: always
+
−
+
−# WebTransport Redirect support
+
−- name: network.webtransport.redirect.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Wifi-scan polling period, in ms, when on a mobile network.
+
−# A value of 0 indicates that no polling should be done.
+
−- name: network.wifi.scanning_period
+
−  type: RelaxedAtomicUint32
+
−  value: 60000
+
−  mirror: always
+
−
+
−# When the Access-Control-Allow-Headers is wildcard (*), whether to allow
+
−# CORS-protected requests with the Authorization request header.
+
−- name: network.cors_preflight.authorization_covered_by_wildcard
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "nglayout."
+
−#---------------------------------------------------------------------------
+
−
+
−# Enable/disable display list invalidation logging --- useful for debugging.
+
−- name: nglayout.debug.invalidation
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: nglayout.debug.disable_xul_cache
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: nglayout.initialpaint.delay
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−- name: nglayout.initialpaint.delay_in_oopif
+
−  type: int32_t
+
−  value: 5
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "page_load."
+
−#---------------------------------------------------------------------------
+
−
+
−# Time in milliseconds during which certain tasks are deprioritized during
+
−# page load.
+
−- name: page_load.deprioritization_period
+
−  type: RelaxedAtomicUint32
+
−  value: 5000
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "pdfjs."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: pdfjs.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "permissions."
+
−#---------------------------------------------------------------------------
+
−
+
−# 1-Accept, 2-Deny, Any other value: Accept
+
−- name: permissions.default.image
+
−  type: RelaxedAtomicUint32
+
−  value: 1
+
−  mirror: always
+
−
+
−- name: permissions.delegation.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: permissions.isolateBy.userContext
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: permissions.isolateBy.privateBrowsing
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "places."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether pages alternative frecency is enabled. This and the following related
+
−# prefs only apply at restart.
+
−- name: places.frecency.pages.alternative.featureGate
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: places.frecency.pages.alternative.highWeight
+
−  type: uint32_t
+
−  value: 100
+
−  mirror: once
+
−
+
−- name: places.frecency.pages.alternative.mediumWeight
+
−  type: uint32_t
+
−  value: 50
+
−  mirror: once
+
−
+
−- name: places.frecency.pages.alternative.lowWeight
+
−  type: uint32_t
+
−  value: 20
+
−  mirror: once
+
−
+
−- name: places.frecency.pages.alternative.halfLifeDays
+
−  type: uint32_t
+
−  value: 30
+
−  mirror: once
+
−
+
−- name: places.frecency.pages.alternative.numSampledVisits
+
−  type: uint32_t
+
−  value: 10
+
−  mirror: once
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "plain_text."
+
−#---------------------------------------------------------------------------
+
−
+
−# When false, text in plaintext documents does not wrap long lines.
+
−- name: plain_text.wrap_long_lines
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "preferences."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: preferences.allow.omt-write
+
−  type: bool
+
−  value: true
+
−  mirror: never
+
−
+
−#ifdef DEBUG
+
−  # If set to true, setting a Preference matched to a `Once` StaticPref will
+
−  # assert that the value matches. Such assertion being broken is a clear flag
+
−  # that the Once policy shouldn't be used.
+
−-   name: preferences.check.once.policy
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−
+
−  # If set to true, StaticPrefs Once policy check will be skipped during
+
−  # automation regression test. Use with care. This pref must be set back to
+
−  # false as soon as specific test has completed.
+
−-   name: preferences.force-disable.check.once.policy
+
−    type: bool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "print."
+
−#---------------------------------------------------------------------------
+
−
+
−# Variation fonts can't always be embedded in certain output formats
+
−# such as PDF. To work around this, draw the variation fonts using
+
−# paths instead of using font embedding.
+
−- name: print.font-variations-as-paths
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we always print silently (without a print dialog).
+
−- name: print.always_print_silent
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we attempt to generate links in Save As PDF output.
+
−- name: print.save_as_pdf.links.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we attempt to generate and use document-internal PDF destinations.
+
−# This currently sometimes results in an internal cairo error, see bug 1725743;
+
−# disabled by default until that is resolved.
+
−- name: print.save_as_pdf.internal_destinations.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we use the CSS @page size as the paper size in PDF output.
+
−- name: print.save_as_pdf.use_page_rule_size_as_paper_size.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The default DPI for printing.
+
−#
+
−# For PDF-based output, DPI should ideally be irrelevant, but in fact it is not
+
−# for multiple reasons:
+
−#
+
−#  * Layout code that tries to respect device pixels (e.g. for snapping glyph
+
−#    positions and baselines, and especially for the "GDI Classic"
+
−#    rendering-mode threshold for certain fonts).
+
−#
+
−#  * The limitations of the PDF format mean that we can't natively represent
+
−#    certain effects, such as filters, in PDF output, so we need to rasterize
+
−#    the parts of the document with these applied.
+
−#
+
−#  * Other rasterized things like images and such are also affected by DPI
+
−#    (both in the output, and the images we select via srcset, for example).
+
−#
+
−# Therefore, using a high DPI is preferable. For now, we use 144dpi to match
+
−# physical printer output on Windows, but higher (e.g. 300dpi) might be better,
+
−# but only if it does not lead to issues such as excessive memory use.
+
−- name: print.default_dpi
+
−  type: float
+
−  value: 144.0f
+
−  mirror: always
+
−
+
−# Whether support for monochrome printing is enabled for CUPS.
+
−- name: print.cups.monochrome.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The maximum amount of time CUPS should spend enumerating print destinations
+
−# (in milliseconds).
+
−# The default value chosen here is completely arbitrary.
+
−- name: print.cups.enum_dests_timeout_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 150
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "privacy."
+
−#---------------------------------------------------------------------------
+
−
+
−# Annotate trackers using the strict list. If set to false, the basic list will
+
−# be used instead.
+
−- name: privacy.annotate_channels.strict_list.enabled
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Annotate trackers using the strict list in the private browsing mode. If set
+
−# to false, the basic list will be used instead.
+
−- name: privacy.annotate_channels.strict_list.pbmode.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# First Party Isolation (double keying), disabled by default.
+
−- name: privacy.firstparty.isolate
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# If false, two windows in the same domain with different first party domains
+
−# (top level URLs) can access resources through window.opener. This pref is
+
−# effective only when "privacy.firstparty.isolate" is true.
+
−- name: privacy.firstparty.isolate.restrict_opener_access
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: privacy.firstparty.isolate.block_post_message
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.firstparty.isolate.use_site
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enforce tracking protection in all modes.
+
−- name: privacy.trackingprotection.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enforce tracking protection in Private Browsing mode.
+
−- name: privacy.trackingprotection.pbmode.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Annotate channels based on the tracking protection list in all modes
+
−- name: privacy.trackingprotection.annotate_channels
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block 3rd party fingerprinting resources.
+
−- name: privacy.trackingprotection.fingerprinting.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Block 3rd party cryptomining resources.
+
−- name: privacy.trackingprotection.cryptomining.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Block 3rd party socialtracking resources.
+
−- name: privacy.trackingprotection.socialtracking.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Consider socialtracking annotation as trackers (see ETP).
+
−- name: privacy.socialtracking.block_cookies.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block 3rd party emailtracking resources in all mode.
+
−- name: privacy.trackingprotection.emailtracking.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Block 3rd party emailtracking resources in Private Browsing mode.
+
−- name: privacy.trackingprotection.emailtracking.pbmode.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Collecting 3rd party emailtracking telemetry.
+
−- name: privacy.trackingprotection.emailtracking.data_collection.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: privacy.trackingprotection.testing.report_blocked_node
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to spoof user locale to English (used as part of Resist
+
−# Fingerprinting).
+
−# 0 - will prompt
+
−# 1 - don't spoof
+
−# 2 - spoof
+
−- name: privacy.spoof_english
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Send "do not track" HTTP header, disabled by default.
+
−- name: privacy.donottrackheader.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Potentially send "global privacy control" HTTP header and set navigator
+
−# property accordingly. Communicates user's desire to opt-out/in of
+
−# websites or services selling or sharing the user's information, false by
+
−# default.
+
−# true - Send the header with a value of 1 to indicate opting-out
+
−# false - Do not send header to indicate opting-in
+
−- name: privacy.globalprivacycontrol.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Controls whether or not GPC signals are sent. Meant to act as a third option
+
−# of 'undecided' by leaving the navigator property undefined and not attaching
+
−# the Sec-GPC HTTP header.
+
−- name: privacy.globalprivacycontrol.functionality.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Lower the priority of network loads for resources on the tracking protection
+
−# list.  Note that this requires the
+
−# privacy.trackingprotection.annotate_channels pref to be on in order to have
+
−# any effect.
+
−- name: privacy.trackingprotection.lower_network_priority
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# A subset of Resist Fingerprinting protections focused specifically on timers.
+
−# This affects the Animation API, the performance APIs, Date.getTime,
+
−# Event.timestamp, File.lastModified, audioContext.currentTime,
+
−# canvas.captureStream.currentTime.
+
−- name: privacy.reduceTimerPrecision
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If privacy.reduceTimerPrecision is false, this pref controls whether or not
+
−# to clamp all timers at a fixed 20 microsconds. It should always be enabled,
+
−# and is only specified as a pref to enable an emergency disabling in the event
+
−# of catastrophic failure.
+
−- name: privacy.reduceTimerPrecision.unconditional
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The resistFingerprinting variables are marked with 'Relaxed' memory ordering.
+
−# We don't particurally care that threads have a percently consistent view of
+
−# the values of these prefs. They are not expected to change often, and having
+
−# an outdated view is not particurally harmful. They will eventually become
+
−# consistent.
+
−#
+
−# The variables will, however, be read often (specifically .microseconds on
+
−# each timer rounding) so performance is important.
+
−- name: privacy.resistFingerprinting
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# When the .pbmode pref is on, RFP or FPP will be enabled in PBM
+
−# When the non-pbm pref is on, they will be enabled in PBM and non-PBM
+
−- name: privacy.resistFingerprinting.pbmode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# privacy.fingerprintingProtection enables a set of fingerprinting protections
+
−# designed to minimize breakage while maximizing protection.
+
−- name: privacy.fingerprintingProtection
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−- name: privacy.fingerprintingProtection.pbmode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# We automatically decline canvas permission requests if they are not initiated
+
−# from user input. Just in case that breaks something, we allow the user to
+
−# revert this behavior with this obscure pref. We do not intend to support this
+
−# long term. If you do set it, to work around some broken website, please file
+
−# a bug with information so we can understand why it is needed.
+
−- name: privacy.resistFingerprinting.autoDeclineNoUserInputCanvasPrompts
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# This pref can be used to disable mozAddonManager entirely for fingerprinting
+
−# reasons. Someone like Tor browser will use this pref.
+
−# NOTE: We'd like this to be a "hidden" pref once StaticPrefs supports it.
+
−- name: privacy.resistFingerprinting.block_mozAddonManager
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether canvas extraction should result in random data. If false, canvas
+
−# extraction results in all-white, opaque pixel data.
+
−- name: privacy.resistFingerprinting.randomDataOnCanvasExtract
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The log level for browser console messages logged in RFPHelper.sys.mjs. Change to
+
−# 'All' and restart to see the messages.
+
−- name: privacy.resistFingerprinting.jsmloglevel
+
−  type: String
+
−  value: "Warn"
+
−  mirror: never
+
−
+
−# Enable jittering the clock one precision value forward.
+
−- name: privacy.resistFingerprinting.reduceTimerPrecision.jitter
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Dynamically tune the resolution of the timer reduction for
+
−# `privacy.reduceTimerPrecision` and `privacy.resistFingerprinting`.
+
−- name: privacy.resistFingerprinting.reduceTimerPrecision.microseconds
+
−  type: RelaxedAtomicUint32
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: privacy.resistFingerprinting.target_video_res
+
−  type: uint32_t
+
−  value: 480
+
−  mirror: always
+
−
+
−# Enable resetting the fingerprinting randomization key daily for normal windwos.
+
−- name: privacy.resistFingerprinting.randomization.daily_reset.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enable resetting the fingerprinting randomization key daily for private windwos.
+
−- name: privacy.resistFingerprinting.randomization.daily_reset.private.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−
+
−# Anti-tracking permission expiration.
+
−- name: privacy.restrict3rdpartystorage.expiration
+
−  type: uint32_t
+
−  value: 2592000   # 30 days (in seconds)
+
−  mirror: always
+
−
+
−# Report Anti-tracking warnings to console lazily
+
−- name: privacy.restrict3rdpartystorage.console.lazy
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable the heuristic to allow storage access for windows opened using window.open() after user interaction
+
−- name: privacy.restrict3rdpartystorage.heuristic.opened_window_after_interaction
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable the heuristic to allow storage access for windows opened using window.open()
+
−- name: privacy.restrict3rdpartystorage.heuristic.window_open
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable the heuristic to allow storage access for windows opened using window.open()
+
−- name: privacy.restrict3rdpartystorage.heuristic.redirect
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Anti-tracking permission expiration.
+
−- name: privacy.restrict3rdpartystorage.expiration_redirect
+
−  type: uint32_t
+
−  value: 2592000   # 30 days (in seconds)
+
−  mirror: always
+
−
+
−# Anti-tracking user-interaction expiration.
+
−- name: privacy.userInteraction.expiration
+
−  type: uint32_t
+
−  value: 3888000   # 45 days (in seconds)
+
−  mirror: always
+
−
+
−# Anti-tracking user-interaction document interval.
+
−- name: privacy.userInteraction.document.interval
+
−  type: uint32_t
+
−  value: 1800   # 30 minutes (in seconds)
+
−  mirror: always
+
−
+
−# Enable Anti-tracking testing. When it enables, it will notify the observers
+
−# when user-interaction permission or storage access permission is added. This
+
−# is for testing only.
+
−- name: privacy.antitracking.testing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Controls the anti-tracking webcompat features. This includes:
+
−# - All URL-Classifier and state partitioning skip lists (prefs and remote
+
−#   settings)
+
−# - Storage access heuristics (opener, redirect, etc.)
+
−# - StorageAccessAPI automatic grants (skips the prompt)
+
−# - Allowing specific tracking channels on user opt-in (e.g. facebook login
+
−#   shim).
+
−- name: privacy.antitracking.enableWebcompat
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enable the heuristic to allow storage access for recent visited pages
+
−- name: privacy.restrict3rdpartystorage.heuristic.recently_visited
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Valid time gap since last visit
+
−- name: privacy.restrict3rdpartystorage.heuristic.recently_visited_time
+
−  type: uint32_t
+
−  value: 600    # 10 minutes
+
−  mirror: always
+
−
+
−# Recent visited pages redirection permission expiration.
+
−- name: privacy.restrict3rdpartystorage.expiration_visited
+
−  type: uint32_t
+
−  value: 2592000   # 30 days (in seconds)
+
−  mirror: always
+
−
+
−# Maximum client-side cookie life-time cap. Measured in seconds, set to 0 to
+
−# disable.
+
−- name: privacy.documentCookies.maxage
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: privacy.window.maxInnerWidth
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: privacy.window.maxInnerHeight
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: privacy.sanitize.sanitizeOnShutdown
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.clearOnShutdown.cache
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.dynamic_firstparty.limitForeign
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.dynamic_firstparty.use_site
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: privacy.partition.network_state
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Partition the OCSP cache by the partitionKey.
+
−- name: privacy.partition.network_state.ocsp_cache
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Partition the OCSP cache by the partitionKey for private browsing mode.
+
−- name: privacy.partition.network_state.ocsp_cache.pbmode
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Always partition web storage APIs except cookies.
+
−- name: privacy.partition.always_partition_third_party_non_cookie_storage
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Exclude session storage from the above preference.
+
−- name: privacy.partition.always_partition_third_party_non_cookie_storage.exempt_sessionstorage
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.partition.bloburl_per_agent_cluster
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: privacy.window.name.update.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# By default, the network state isolation is not active when there is a proxy
+
−# setting. This pref forces the network isolation even in these scenarios.
+
−- name: privacy.partition.network_state.connection_with_proxy
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Partition the service workers unconditionally when dFPI is enabled.
+
−- name: privacy.partition.serviceWorkers
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables / disables the strip on share feature which strips query parameters
+
−# when copying/sharing in-content links or from the url bar.
+
−- name: privacy.query_stripping.strip_on_share.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Enables / disables the URL query string stripping in normal browsing mode
+
−# which strips query parameters from loading URIs to prevent bounce (redirect)
+
−# tracking.
+
−- name: privacy.query_stripping.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Same as the pref above, but controls query stripping for private browsing
+
−# mode.
+
−- name: privacy.query_stripping.enabled.pbmode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# The list which contains query parameters that are needed to be stripped from
+
−# URIs. The query parameters are separated by a space.
+
−- name: privacy.query_stripping.strip_list
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# This controls if we will do the query string stripping for redirects.
+
−- name: privacy.query_stripping.redirect
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# the list which contains sites where should exempt from query stripping
+
−- name: privacy.query_stripping.allow_list
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# Main pref to enable / disable the feature.
+
−- name: privacy.bounceTrackingProtection.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# How long to wait for a client redirect after a navigation ends.
+
−- name: privacy.bounceTrackingProtection.clientBounceDetectionTimerPeriodMS
+
−  type: uint32_t
+
−  value: 10000
+
−  mirror: always
+
−
+
−# Whether only bounces that access storage should be considered trackers.
+
−- name: privacy.bounceTrackingProtection.requireStatefulBounces
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# To be used in test environments to enable observer messages.
+
−- name: privacy.bounceTrackingProtection.enableTestMode
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "prompts."
+
−#---------------------------------------------------------------------------
+
−
+
−# Prompt modal type prefs
+
−# See nsIPromptService::MODAL_TYPE fields for possible values.
+
−
+
−# Insecure form submit warning.
+
−- name: prompts.modalType.insecureFormSubmit
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# nsHttpChannelAuthProvider#ConfirmAuth anti-phishing prompts.
+
−- name: prompts.modalType.confirmAuth
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "security."
+
−#---------------------------------------------------------------------------
+
−
+
−# Mochitests that need to load resource:// URIs not declared content-accessible
+
−# in manifests should set this pref.
+
−- name: security.all_resource_uri_content_accessible
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.bad_cert_domain_error.url_fix_enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.csp.reporting.script-sample.max-length
+
−  type: int32_t
+
−  value: 40
+
−  mirror: always
+
−
+
−- name: security.csp.truncate_blocked_uri_for_frame_navigations
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Limit the number of CSP reports that are send in a specific timespan.
+
−- name: security.csp.reporting.limit.count
+
−  type: uint32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# Time span in seconds for reporting limit.
+
−- name: security.csp.reporting.limit.timespan
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# If true, all toplevel data: URI navigations will be blocked.
+
−# Please note that manually entering a data: URI in the
+
−# URL-Bar will not be blocked when flipping this pref.
+
−- name: security.data_uri.block_toplevel_data_uri_navigations
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether window A is allowed to navigate cross-origin window B (that is not
+
−# a descendant frame of A) to a URI that loads externally.
+
−- name: security.allow_disjointed_external_uri_loads
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
+
−# not allowed for Firefox Desktop in firefox.js
+
−- name: security.allow_parent_unrestricted_js_loads
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
+
−# not allowed for Firefox Desktop in firefox.js
+
−- name: security.allow_eval_with_system_principal
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Allowed by default so it doesn't affect Thunderbird/SeaMonkey, but
+
−# not allowed for Firefox Desktop in firefox.js
+
−- name: security.allow_eval_in_parent_process
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disallowed by default, ensure not disallowed content is loaded in the parent
+
−# process.
+
−- name: security.allow_unsafe_parent_loads
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref to block mixed scripts (fonts, plugin content, scripts, stylesheets,
+
−# iframes, websockets, XHR).
+
−- name: security.mixed_content.block_active_content
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# Pref to block sub requests that happen within an object.
+
−- name: security.mixed_content.block_object_subrequest
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref for mixed display content blocking (images, audio, video).
+
−- name: security.mixed_content.block_display_content
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Pref for mixed display content upgrading (images, audio, video).
+
−- name: security.mixed_content.upgrade_display_content
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether strict file origin policy is in effect. "False" is traditional.
+
−- name: security.fileuri.strict_origin_policy
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The level to which we sandbox the content process. firefox.js sets the
+
−# default to different values on a per-OS basis, and has documentation
+
−# on what the defaults are and what the numbers mean.
+
−- name: security.sandbox.content.level
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true # Consumers should use SandboxSettings to ask.
+
−
+
−- name: security.sandbox.socket.process.level
+
−  type: int32_t
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true # Consumers should use SandboxSettings to ask.
+
−
+
−# This controls the strength of the Windows GPU process sandbox.  Changes
+
−# will require restart.
+
−# For information on what the level number means, see
+
−# SetSecurityLevelForGPUProcess() in
+
−# security/sandbox/win/src/sandboxbroker/sandboxBroker.cpp
+
−- name: security.sandbox.gpu.level
+
−  type: int32_t
+
−#if defined(XP_WIN)
+
−  value: 1
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# Enrollment preferences for the win32k experiment, set and managed by Normandy
+
−- name: security.sandbox.content.win32k-experiment.enrollmentStatus
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: never
+
−
+
−- name: security.sandbox.content.win32k-experiment.startupEnrollmentStatus
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: never
+
−
+
−#if defined(XP_WIN) && defined(MOZ_SANDBOX)
+
−
+
−  # Whether win32k is disabled for content processes.
+
−  # true means win32k system calls are not permitted.
+
−-   name: security.sandbox.content.win32k-disable
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Note: win32k is currently _not_ disabled for GMP due to intermittent test
+
−  # failures, where the GMP process fails very early. See bug 1449348.
+
−-   name: security.sandbox.gmp.win32k-disable
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−  # Whether win32k is disabled for socket processes.
+
−  # true means win32k system calls are not permitted.
+
−-   name: security.sandbox.socket.win32k-disable
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether CET User Shadow Stack compatible modules only is enabled for the
+
−  # relevant process type.
+
−-   name: security.sandbox.content.shadow-stack.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−
+
−-   name: security.sandbox.rdd.shadow-stack.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: security.sandbox.socket.shadow-stack.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: security.sandbox.gpu.shadow-stack.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−-   name: security.sandbox.gmp.shadow-stack.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−  # Whether a Low Privilege AppContainer (LPAC) is enabled for the relevant
+
−  # process type.
+
−
+
−#if defined(MOZ_WMF_MEDIA_ENGINE)
+
−-   name: security.sandbox.utility-wmf-cdm.lpac.enabled
+
−    type: RelaxedAtomicBool
+
−    value: false
+
−    mirror: always
+
−#endif
+
−
+
−  # Whether Arbitrary Code Guard is enabled for the RDD process.
+
−-   name: security.sandbox.rdd.acg.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−
+
−#ifdef MOZ_WMF
+
−  # Whether Arbitrary Code Guard is enabled for the utility WMF audio decoder
+
−  # process.
+
−
+
−-   name: security.sandbox.utility-wmf.acg.enabled
+
−    type: RelaxedAtomicBool
+
−    value: true
+
−    mirror: always
+
−#endif  // MOZ_WMF
+
−
+
−  # This controls the depth of stack trace that is logged when Windows sandbox
+
−  # logging is turned on. This is only currently available for the content
+
−  # process because the only other sandbox (for GMP) has too strict a policy to
+
−  # allow stack tracing. This does not require a restart to take effect.
+
−-   name: security.sandbox.windows.log.stackTraceDepth
+
−    type: RelaxedAtomicUint32
+
−    value: 0
+
−    mirror: always
+
−#endif
+
−
+
−#if defined(XP_LINUX) && defined(MOZ_SANDBOX)
+
−  # Run content processes in headless mode and disallow
+
−  # connections to the X server.  Requires:
+
−  # * `webgl.out-of-process` (or else WebGL breaks)
+
−  # * `widget.non-native-theme.enabled` (scrollbars & form controls)
+
−  # Changing it requires a restart because sandbox policy information
+
−  # dependent on it is cached.  See bug 1640345 for details.
+
−- name: security.sandbox.content.headless
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−#endif
+
−
+
−# Pref to show warning when submitting from secure to insecure.
+
−- name: security.warn_submit_secure_to_insecure
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Hardware Origin-bound Second Factor Support
+
−- name: security.webauth.webauthn
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Navigate-to CSP 3 directive
+
−- name: security.csp.enableNavigateTo
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# wasm-unsafe-eval source keyword
+
−- name: security.csp.wasm-unsafe-eval.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# unsafe-hashes source keyword
+
−- name: security.csp.unsafe-hashes.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The script-src-attr and script-src-elem directive
+
−- name: security.csp.script-src-attr-elem.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# The style-src-attr and style-src-elem directive
+
−- name: security.csp.style-src-attr-elem.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.csp.external-hashes.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# WebAuthn CTAP2 support
+
−- name: security.webauthn.ctap2
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−  rust: true
+
−
+
−# Dispatch WebAuthn requests to the software CTAP1 token.
+
−# (mutually exclusive with webauthn_enable_android_fido2,
+
−# and webauthn_enable_usbtoken)
+
−- name: security.webauth.webauthn_enable_softtoken
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Dispatch WebAuthn requests to the Android platform API
+
−- name: security.webauth.webauthn_enable_android_fido2
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# residentKey support when using Android platform API
+
−- name: security.webauthn.webauthn_enable_android_fido2.residentkey
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Dispatch WebAuthn requests to authenticator-rs
+
−- name: security.webauth.webauthn_enable_usbtoken
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−# Skip direct attestation consent prompts (for tests).
+
−- name: security.webauth.webauthn_testing_allow_direct_attestation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Global counter for U2F soft token operations
+
−- name: security.webauth.softtoken_counter
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Block Worker/SharedWorker scripts with wrong MIME type.
+
−- name: security.block_Worker_with_wrong_mime
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Block the execution of scripts using a wrong type as defined by the file extension
+
−# (OS) mapping when loaded via the file:// protocol.
+
−- name: security.block_fileuri_script_with_wrong_mime
+
−  type: bool
+
−  value: @IS_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Cancel outgoing requests from SystemPrincipal:
+
−# but only with scheme http(s) and contentpolicytype subdocument
+
−- name: security.disallow_privileged_https_subdocuments_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# but only with scheme data and contentpolicytype subdocument
+
−- name: security.disallow_privileged_data_subdocuments_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Cancel outgoing requests from SystemPrincipal:
+
−# but only with scheme http(s) and contentpolicytype stylesheet
+
−- name: security.disallow_privileged_https_stylesheet_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Cancel outgoing requests from SystemPrincipal:
+
−# but only with scheme http(s) and contentpolicytype script
+
−- name: security.disallow_privileged_https_script_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Cancel outgoing requests from SystemPrincipal:
+
−# where there is no finalURI.
+
−- name: security.disallow_privileged_no_finaluri_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Cancel outgoing requests from privileged about pages:
+
−# but only with scheme http(s) and contentpolicytype script
+
−- name: security.disallow_privilegedabout_remote_script_loads
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Disable preloaded static key pins by default.
+
−- name: security.cert_pinning.enforcement_level
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−  do_not_use_directly: true
+
−
+
−# OCSP fetching behavior:
+
−# 0: do not fetch OCSP
+
−# 1: fetch OCSP for DV and EV certificates
+
−# 2: fetch OCSP only for EV certificates
+
−- name: security.OCSP.enabled
+
−  type: RelaxedAtomicUint32
+
−#ifdef ANDROID
+
−  value: 2
+
−#else
+
−  value: 1
+
−#endif
+
−  mirror: always
+
−
+
−
+
−# Whether or not OCSP is required.
+
−# true => hard-fail (if an OCSP request times out, stop the connection)
+
−# false => soft-fail (if an OCSP request times out, continue the connection)
+
−- name: security.OCSP.require
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# How many milliseconds to wait for an OCSP response before assuming it failed
+
−# (when fetching for soft-fail).
+
−- name: security.OCSP.timeoutMilliseconds.soft
+
−  type: RelaxedAtomicUint32
+
−#ifdef RELEASE_OR_BETA
+
−  value: 2000
+
−#else
+
−  value: 1000
+
−#endif
+
−  mirror: always
+
−
+
−# How many milliseconds to wait for an OCSP response before assuming it failed
+
−# (when fetching for hard-fail).
+
−- name: security.OCSP.timeoutMilliseconds.hard
+
−  type: RelaxedAtomicUint32
+
−  value: 10000
+
−  mirror: always
+
−
+
−# Whether or not to enable OCSP must-staple (in other words, TLS-feature with
+
−# status request).
+
−- name: security.ssl.enable_ocsp_must_staple
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether or not to enable OCSP stapling.
+
−- name: security.ssl.enable_ocsp_stapling
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# This is checked at startup to see if NSS should be initialized without the
+
−# user's certificate and key databases.
+
−- name: security.nocertdb
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Whether or not to import and trust third party root certificates from the OS.
+
−- name: security.enterprise_roots.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.intermediate_preloading_healer.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−- name: security.intermediate_preloading_healer.timer_interval_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 300000
+
−  mirror: always
+
−
+
−# If true, attempt to load the osclientcerts PKCS#11 module at startup on a
+
−# background thread. This module allows Firefox to use client certificates
+
−# stored in OS certificate storage. Currently only available for Windows and
+
−# macOS.
+
−- name: security.osclientcerts.autoload
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If true, assume tokens accessed via osclientcerts implement RSA-PSS. If a
+
−# given token does not support RSA-PSS, users may see the error
+
−# 'SEC_ERROR_PKCS11_GENERAL_ERROR' if a server indicates it will accept an
+
−# RSA-PSS signature in the client's certificate verify message.
+
−# Setting this to false may allow such connections to succeed, if the server
+
−# also accepts RSA-PKCS1 signatures.
+
−- name: security.osclientcerts.assume_rsa_pss_support
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.pki.cert_short_lifetime_in_days
+
−  type: RelaxedAtomicUint32
+
−  value: 10
+
−  mirror: always
+
−
+
−# security.pki.netscape_step_up_policy controls how the platform handles the
+
−# id-Netscape-stepUp OID in extended key usage extensions of CA certificates.
+
−# 0: id-Netscape-stepUp is always considered equivalent to id-kp-serverAuth
+
−# 1: it is considered equivalent when the notBefore is before 23 August 2016
+
−# 2: similarly, but for 23 August 2015
+
−# 3: it is never considered equivalent
+
−- name: security.pki.netscape_step_up_policy
+
−  type: RelaxedAtomicUint32
+
−#ifdef RELEASE_OR_BETA
+
−  value: 1
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−# Configures Certificate Transparency support mode:
+
−# 0: Fully disabled.
+
−# 1: Only collect telemetry. CT qualification checks are not performed.
+
−- name: security.pki.certificate_transparency.mode
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# 0: Disable CRLite entirely.
+
−# 1: Consult CRLite but only collect telemetry.
+
−# 2: Consult CRLite and enforce both "Revoked" and "Not Revoked" results.
+
−# 3: Consult CRLite and enforce "Not Revoked" results, but defer to OCSP for "Revoked".
+
−- name: security.pki.crlite_mode
+
−  type: RelaxedAtomicUint32
+
−  value: 3
+
−  mirror: always
+
−
+
−- name: security.tls.version.min
+
−  type: RelaxedAtomicUint32
+
−  value: 3
+
−  mirror: always
+
−
+
−- name: security.tls.version.max
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−- name: security.tls.version.enable-deprecated
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.tls.version.fallback-limit
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−# Turn off post-handshake authentication for TLS 1.3 by default,
+
−# until the incompatibility with HTTP/2 is resolved:
+
−# https://tools.ietf.org/html/draft-davidben-http2-tls13-00
+
−- name: security.tls.enable_post_handshake_auth
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Probability of GREASEing a TLS connection with ECH (0-100)
+
−# 0 means never GREASE, 100 means always GREASE
+
−- name: security.tls.ech.grease_probability
+
−  type: RelaxedAtomicUint32
+
−#ifdef NIGHTLY_BUILD
+
−  value: 100
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# Whether to apply ECH GREASE settings to HTTP3/QUIC connections
+
−- name: security.tls.ech.grease_http3
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# Whether to retry connections without ECH Grease
+
−- name: security.tls.ech.disable_grease_on_fallback
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−# ECH GREASE Padding target (1-255)
+
−- name: security.tls.ech.grease_size
+
−  type: RelaxedAtomicUint32
+
−  value: 100
+
−  mirror: always
+
−
+
−- name: security.tls.hello_downgrade_check
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.tls.enable_delegated_credentials
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.tls.enable_0rtt_data
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl.treat_unsafe_negotiation_as_broken
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.ssl.require_safe_negotiation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.ssl.enable_false_start
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl.enable_alpn
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl.disable_session_identifiers
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_rsa_aes_128_gcm_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_ecdsa_aes_128_gcm_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_ecdsa_chacha20_poly1305_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_rsa_chacha20_poly1305_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_ecdsa_aes_256_gcm_sha384
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_rsa_aes_256_gcm_sha384
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_rsa_aes_128_sha
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_ecdsa_aes_128_sha
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_rsa_aes_256_sha
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.ecdhe_ecdsa_aes_256_sha
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−- name: security.ssl3.dhe_rsa_aes_128_sha
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.ssl3.dhe_rsa_aes_256_sha
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: security.ssl3.rsa_aes_128_sha
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.rsa_aes_256_sha
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.rsa_aes_128_gcm_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.rsa_aes_256_gcm_sha384
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.ssl3.deprecated.rsa_des_ede3_sha
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.tls13.aes_128_gcm_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.tls13.chacha20_poly1305_sha256
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: security.tls13.aes_256_gcm_sha384
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "signon."
+
−#---------------------------------------------------------------------------
+
−- name: signon.usernameOnlyForm.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "slider."
+
−#---------------------------------------------------------------------------
+
−
+
−# Scrollbar snapping region.
+
−# - 0: off
+
−# - 1 and higher: slider thickness multiple
+
−- name: slider.snapMultiplier
+
−  type: int32_t
+
−#ifdef XP_WIN
+
−  value: 6
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: once
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "storage."
+
−#---------------------------------------------------------------------------
+
−
+
−# Whether to use a non-exclusive VFS.
+
−# By default we use the unix-excl VFS, for the following reasons:
+
−# 1. It improves compatibility with NFS shares, whose implementation
+
−#    is incompatible with SQLite's locking requirements (reliable fcntl), and
+
−#    in particular with WAL journaling.
+
−#    Bug 433129 attempted to automatically identify such file-systems,
+
−#    but a reliable way was not found and the fallback locking is slower than
+
−#    POSIX locking, so we do not want to do it by default.
+
−# 2. It allows wal mode to avoid the memory mapped -shm file, reducing the
+
−#    likelihood of SIGBUS failures when disk space is exhausted.
+
−# 3. It provides some protection from third party database tampering while a
+
−#    connection is open.
+
−# Note there's no win32-excl VFS, so this has no effect on Windows.
+
−- name: storage.sqlite.exclusiveLock.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "svg."
+
−#---------------------------------------------------------------------------
+
−
+
−# This pref controls whether the 'context-fill' and 'context-stroke' keywords
+
−# can be used in SVG-as-an-image in the content processes to use the fill/
+
−# stroke specified on the element that embeds the image. (These keywords are
+
−# always enabled in the chrome process, regardless of this pref.) Also, these
+
−# keywords are currently not part of any spec, which is partly why we disable
+
−# them for web content.
+
−- name: svg.context-properties.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# This pref controls whether the `prefers-color-scheme` value of SVG images
+
−# reacts to the embedder `color-scheme` in content.
+
−- name: svg.embedder-prefers-color-scheme.content.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Enables the 'context-fill' and 'context-stroke' keywords for particular
+
−# domains. We expect this list to be Mozilla-controlled properties, since the
+
−# 'context-*' keywords are not part of any spec. We expect to remove this
+
−# preference and the 'context-` keyword support entirely in the
+
−# not-too-distant future when a standardized alternative ships. This preference
+
−# is _not_ for allowing web content to use these keywords. For performance
+
−# reasons, the list of domains in this preference should remain short in
+
−# length.
+
−- name: svg.context-properties.content.allowed-domains
+
−  type: String
+
−  value: ""
+
−  mirror: never
+
−
+
−# Is support for the new getBBox method from SVG 2 enabled?
+
−# See https://svgwg.org/svg2-draft/single-page.html#types-SVGBoundingBoxOptions
+
−- name: svg.new-getBBox.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether SVGGraphicsElement.nearestViewportElement and SVGGraphicsElement.farthestViewportElement are enabled.
+
−- name: svg.nearestAndFarthestViewportElement.enabled
+
−  type: bool
+
−  value: @IS_NOT_EARLY_BETA_OR_EARLIER@
+
−  mirror: always
+
−
+
−# Tweak which elements are allowed in <svg:use> subtrees, and in which
+
−# circumstances. See RemoveForbiddenNodes in SVGUseElement.cpp for the spec
+
−# text.
+
−#
+
−# - 0: Don't restrict ever.
+
−# - 1: Restrict only cross-document.
+
−# - 2/other: restrict always.
+
−#
+
−# We allow the behavior to be configurable via this pref. Our chosen default
+
−# value forbids non-graphical content in <svg:use> clones of cross-document
+
−# elements. This is a compromise between our more-permissive pre-existing
+
−# behavior (which SVG 2 seems to call for, and maps to pref value 0) and the
+
−# behavior of other UAs (which SVG 1.1 seems to call for, and maps to pref
+
−# value 2).
+
−- name: svg.use-element.graphics-element-restrictions
+
−  type: int32_t
+
−  value: 1
+
−  mirror: always
+
−
+
−# Whether to restrict <svg:use> element recursion levels.
+
−#
+
−# - 0: Don't restrict ever.
+
−# - 1: Restrict everywhere
+
−# - 2/other: Restrict only in the parent process.
+
−#
+
−- name: svg.use-element.recursive-clone-limit.enabled
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# What is the recursion limit for svg use element cloning if enabled.
+
−- name: svg.use-element.recursive-clone-limit
+
−  type: uint32_t
+
−  value: 8
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "telemetry."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: telemetry.number_of_site_origin.min_interval
+
−  type: uint32_t
+
−  value: 300000
+
−  mirror: always
+
−
+
−- name: telemetry.fog.test.localhost_port
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−  rust: true
+
−
+
−- name: telemetry.fog.test.activity_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 120
+
−  mirror: always
+
−  rust: true
+
−
+
−- name: telemetry.fog.test.inactivity_limit
+
−  type: RelaxedAtomicUint32
+
−  value: 1200
+
−  mirror: always
+
−  rust: true
+
−
+
−- name: telemetry.fog.artifact_build
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "test."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: test.events.async.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: test.mousescroll
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "thread."
+
−#---------------------------------------------------------------------------
+
−
+
−# If control tasks aren't enabled, they get medium high priority.
+
−- name: threads.control_event_queue.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# If the service is available, set threads to low-power mode when in the background.
+
−- name: threads.use_low_power.enabled
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−
+
−# If the process priority is set to background, put the main thread in the background.
+
−# Currently off by default.
+
−- name: threads.lower_mainthread_priority_in_background.enabled
+
−  type: bool
+
−  value: @IS_NIGHTLY_BUILD@
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "timer."
+
−#---------------------------------------------------------------------------
+
−
+
−# Since our timestamp on macOS does not increment while the system is asleep, we
+
−# should ignore sleep/wake notifications to make timer thread process timers.
+
−- name: timer.ignore_sleep_wake_notifications
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_MACOSX
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Amount of time by which it is always acceptable to delay the firing of a timer.
+
−# Any timer may be delayed by up to this amount in order to enable timers to be
+
−# bundled together for efficiency.
+
−- name: timer.minimum_firing_delay_tolerance_ms
+
−  type: AtomicFloat
+
−  value: 1.0
+
−  mirror: always
+
−
+
−# Maximum amount of time by which it is ever acceptable to delay the firing of a timer.
+
−# Setting this to zero will effectively disable timer coalescing.
+
−- name: timer.maximum_firing_delay_tolerance_ms
+
−  type: AtomicFloat
+
−  value: 10000.0
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "toolkit."
+
−#---------------------------------------------------------------------------
+
−
+
−# Makes removeDirectory background task wait for the given milliseconds before removal.
+
−- name: toolkit.background_tasks.remove_directory.testing.sleep_ms
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−# Returns true if BHR is disabled.
+
−- name: toolkit.content-background-hang-monitor.disabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: toolkit.scrollbox.smoothScroll
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: toolkit.scrollbox.horizontalScrollDistance
+
−  type: RelaxedAtomicInt32
+
−  value: 5
+
−  mirror: always
+
−
+
−- name: toolkit.scrollbox.verticalScrollDistance
+
−  type: RelaxedAtomicInt32
+
−  value: 3
+
−  mirror: always
+
−
+
−# The lateWriteChecksStage and fastShutdownStage below represent the stage
+
−# of shutdown after which we (for lateWriteChecksStage) crash / gather
+
−# telemetry data on file writes, or (for fastShutdownStage) we call _exit(0).
+
−# Higher values are earlier during shutdown, and the full enumeration can
+
−# be found in AppShutdown.h in the AppShutdownPhase enum.
+
−- name: toolkit.shutdown.lateWriteChecksStage
+
−  type: int32_t
+
−#ifdef MOZ_CODE_COVERAGE
+
−  value: 0
+
−#else
+
−  value: 2
+
−#endif
+
−  mirror: always
+
−
+
−# See the comment above toolkit.shutdown.lateWriteChecksStage. A higher value
+
−# for this pref means we call _exit(0) earlier during shutdown.
+
−- name: toolkit.shutdown.fastShutdownStage
+
−  type: int32_t
+
−#if !defined(DEBUG) && !defined(MOZ_ASAN) && !defined(MOZ_TSAN) && !defined(MOZ_CODE_COVERAGE) && !defined(MOZ_VALGRIND) && !defined(MOZ_PROFILE_GENERATE) && !defined(JS_STRUCTURED_SPEW)
+
−  value: 1
+
−#else
+
−  value: 0
+
−#endif
+
−  mirror: always
+
−
+
−# Sending each remote accumulation immediately places undue strain on the IPC
+
−# subsystem. Batch the remote accumulations for a period of time before sending
+
−# them all at once. This value was chosen as a balance between data timeliness
+
−# and performance (see bug 1218576).
+
−- name: toolkit.telemetry.ipcBatchTimeout
+
−  type: uint32_t
+
−  value: 2000
+
−  mirror: always
+
−
+
−- name: toolkit.telemetry.geckoview.batchDurationMS
+
−  type: RelaxedAtomicUint32
+
−  value: 5000
+
−  mirror: always
+
−
+
−- name: toolkit.telemetry.geckoview.maxBatchStalenessMS
+
−  type: RelaxedAtomicUint32
+
−  value: 60000
+
−  mirror: always
+
−
+
−- name: toolkit.telemetry.geckoview.streaming
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: toolkit.telemetry.testing.overrideProductsCheck
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "ui."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: ui.key.generalAccessKey
+
−  type: int32_t
+
−  value: -1
+
−  mirror: always
+
−
+
−# Use 17 for Ctrl, 18 for Alt, 224 for Meta, 91 for Win, 0 for none.
+
−- name: ui.key.accelKey
+
−  type: uint32_t
+
−#ifdef XP_MACOSX
+
−  value: 224
+
−#else
+
−  value: 17
+
−#endif
+
−  mirror: always
+
−
+
−# See above for the key codes to use.
+
−- name: ui.key.menuAccessKey
+
−  type: uint32_t
+
−#ifdef XP_MACOSX
+
−  value: 0
+
−#else
+
−  value: 18
+
−#endif
+
−  mirror: always
+
−
+
−# Only used if generalAccessKey is -1.
+
−- name: ui.key.chromeAccess
+
−  type: int32_t
+
−#ifdef XP_MACOSX
+
−  # 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 3 =  ctrl+shift, 8 = Meta
+
−  value: 2
+
−#else
+
−  # 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 5 =  Alt+Shift,
+
−  # 8 = Meta, 16 = Win
+
−  value: 4
+
−#endif
+
−  mirror: always
+
−
+
−# Only used if generalAccessKey is -1.
+
−- name: ui.key.contentAccess
+
−  type: int32_t
+
−#ifdef XP_MACOSX
+
−  # 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 3 = ctrl+shift, 8 = Meta
+
−  value: 6
+
−#else
+
−  # 0 = disabled, 1 = Shift, 2 = Ctrl, 4 = Alt, 5 =  Alt+Shift,
+
−  # 8 = Meta, 16 = Win
+
−  value: 5
+
−#endif
+
−  mirror: always
+
−
+
−# Does the access key by itself focus the menu bar?
+
−- name: ui.key.menuAccessKeyFocuses
+
−  type: bool
+
−#if defined(XP_WIN) || defined(MOZ_WIDGET_GTK)
+
−  # On Windows and Linux, we now default to showing the menu bar only when alt
+
−  # is pressed.
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−# Whether native key bindings in the environment or builtin shortcut key
+
−# definitions in Gecko are used first in <input> and <textarea>
+
−- name: ui.key.textcontrol.prefer_native_key_bindings_over_builtin_shortcut_key_definitions
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−# Only GtkTextView (native multiline text viewer/editor) supports "select-all"
+
−# signal so that we cannot know "select-all" key bindings only with GtkEntry.
+
−# When this pref is set to true, if a key combination does not cause any
+
−# signals in GtkEntry, try to check the key combination is mapped to
+
−# "select-all" in GtkTextView or not.  If it's mapped to other commands, they
+
−# are just ignored.
+
−- name: ui.key.use_select_all_in_single_line_editor
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# Duration of timeout of incremental search in menus (ms).  0 means infinite.
+
−- name: ui.menu.incremental_search.timeout
+
−  type: uint32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# If true, all popups won't hide automatically on blur
+
−- name: ui.popup.disable_autohide
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Negate scroll, true will make the mouse scroll wheel move the screen the
+
−# same direction as with most desktops or laptops.
+
−- name: ui.scrolling.negate_wheel_scroll
+
−  type: RelaxedAtomicBool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# If the user puts a finger down on an element and we think the user might be
+
−# executing a pan gesture, how long do we wait before tentatively deciding the
+
−# gesture is actually a tap and activating the target element?
+
−- name: ui.touch_activation.delay_ms
+
−  type: int32_t
+
−  value: 100
+
−  mirror: always
+
−
+
−# If the user has clicked an element, how long do we keep the :active state
+
−# before it is cleared by the mouse sequences fired after a
+
−# touchstart/touchend.
+
−- name: ui.touch_activation.duration_ms
+
−  type: int32_t
+
−  value: 10
+
−  mirror: always
+
−
+
−# Prevent system colors from being exposed to CSS or canvas.
+
−- name: ui.use_standins_for_native_colors
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Disable page loading activity cursor by default.
+
−- name: ui.use_activity_cursor
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether context menus should only appear on mouseup instead of mousedown,
+
−# on OSes where they normally appear on mousedown (macOS, *nix).
+
−# Note: ignored on Windows (context menus always use mouseup).
+
−- name: ui.context_menus.after_mouseup
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether click-hold context menus are enabled.
+
−- name: ui.click_hold_context_menus
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# How long to wait for a drag gesture before displaying click-hold context menu,
+
−# in milliseconds.
+
−- name: ui.click_hold_context_menus.delay
+
−  type: RelaxedAtomicInt32
+
−  value: 500
+
−  mirror: always
+
−
+
−# When enabled, the touch.radius and mouse.radius prefs allow events to be
+
−# dispatched to nearby elements that are sensitive to the event. See
+
−# PositionedEventTargeting.cpp. The 'mm' prefs define a rectangle around the
+
−# nominal event target point within which we will search for suitable elements.
+
−# 'visitedWeight' is a percentage weight; a value > 100 makes a visited link be
+
−# treated as further away from the event target than it really is, while a
+
−# value < 100 makes a visited link be treated as closer to the event target
+
−# than it really is.
+
−
+
−- name: ui.touch.radius.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−- name: ui.touch.radius.topmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 2
+
−#else
+
−  value: 12
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.touch.radius.rightmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 3
+
−#else
+
−  value: 8
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.touch.radius.bottommm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 2
+
−#else
+
−  value: 4
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.touch.radius.leftmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 3
+
−#else
+
−  value: 8
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.touch.radius.visitedWeight
+
−  type: uint32_t
+
−  value: 120
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.enabled
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.topmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 2
+
−#else
+
−  value: 12
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.rightmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 3
+
−#else
+
−  value: 8
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.bottommm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 2
+
−#else
+
−  value: 4
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.leftmm
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 3
+
−#else
+
−  value: 8
+
−#endif
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.visitedWeight
+
−  type: uint32_t
+
−  value: 120
+
−  mirror: always
+
−
+
−- name: ui.mouse.radius.reposition
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−# When true, the ui.mouse.radius.* prefs will only affect simulated mouse
+
−# events generated by touch input. When false, the prefs will be used for all
+
−# mouse events.
+
−- name: ui.mouse.radius.inputSource.touchOnly
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "urlclassifier."
+
−#---------------------------------------------------------------------------
+
−
+
−# Update server response timeout for Safe Browsing.
+
−- name: urlclassifier.update.response_timeout_ms
+
−  type: uint32_t
+
−  value: 30000
+
−  mirror: always
+
−
+
−# Download update timeout for Safe Browsing.
+
−- name: urlclassifier.update.timeout_ms
+
−  type: uint32_t
+
−  value: 90000
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "view_source."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: view_source.editor.external
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: view_source.wrap_long_lines
+
−  type: bool
+
−  value: @IS_ANDROID@
+
−  mirror: always
+
−
+
−- name: view_source.syntax_highlight
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: view_source.tab_size
+
−  type: int32_t
+
−  value: 4
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "webgl." (for pref access from Worker threads)
+
−#---------------------------------------------------------------------------
+
−
+
−- name: webgl.1.allow-core-profiles
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_MACOSX
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: webgl.angle.force-d3d11
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.angle.try-d3d11
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_WIN
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: webgl.angle.force-warp
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.auto-flush
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.auto-flush.gl
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.can-lose-context-in-foreground
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.cgl.multithreaded
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.colorspaces.prototype
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.debug.incomplete-tex-color
+
−  type: RelaxedAtomicUint32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: webgl.default-antialias
+
−  type: RelaxedAtomicBool
+
−  value: @IS_NOT_ANDROID@
+
−  mirror: always
+
−
+
−- name: webgl.default-no-alpha
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.disable-angle
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.disable-wgl
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.dxgl.enabled
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_WIN
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: webgl.dxgl.needs-finish
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.disable-fail-if-major-performance-caveat
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.disable-DOM-blit-uploads
+
−  type: RelaxedAtomicBool
+
−#if defined(MOZ_AARCH64) && defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−- name: webgl.disabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.enable-debug-renderer-info
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.enable-draft-extensions
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.enable-privileged-extensions
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.enable-renderer-query
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.enable-surface-texture
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.enable-webgl2
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.fake-verts.max
+
−  type: RelaxedAtomicUint32
+
−  value: 10*1000*1000  # 10M as vec4 is count*4*4 = 160MB
+
−  mirror: always
+
−
+
−# Only works on Mac for now.
+
−- name: webgl.forbid-hardware
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Only works on Mac for now.
+
−- name: webgl.forbid-software
+
−  type: RelaxedAtomicBool
+
−  value: true  # It's generally better to encourage fallback to e.g. canvas2d.
+
−  mirror: always
+
−
+
−- name: webgl.force-enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.force-index-validation
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: webgl.lose-context-on-memory-pressure
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.max-contexts
+
−  type: RelaxedAtomicUint32
+
−  value: 1000
+
−  mirror: always
+
−
+
−- name: webgl.max-contexts-per-principal
+
−  type: RelaxedAtomicUint32
+
−  value: 300
+
−  mirror: always
+
−
+
−- name: webgl.max-size-per-texture-mib
+
−  type: RelaxedAtomicUint32
+
−  value: 1024
+
−  mirror: always
+
−
+
−- name: webgl.max-warnings-per-context
+
−  type: RelaxedAtomicUint32
+
−  value: 32
+
−  mirror: always
+
−
+
−- name: webgl.min_capability_mode
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.msaa-force
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.msaa-samples
+
−  type: RelaxedAtomicUint32
+
−  value: 4
+
−  mirror: always
+
−
+
−- name: webgl.out-of-process
+
−  type: RelaxedAtomicBool
+
−# (When reading the next line, know that preprocessor.py doesn't
+
−# understand parentheses, but && is higher precedence than ||.)
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.out-of-process.worker
+
−  type: RelaxedAtomicBool
+
−# (When reading the next line, know that preprocessor.py doesn't
+
−# understand parentheses, but && is higher precedence than ||.)
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.out-of-process.force
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.out-of-process.shmem-size
+
−  type: RelaxedAtomicUint32
+
−  value: 100000 # 100KB
+
−  mirror: always
+
−
+
−- name: webgl.out-of-process.async-present
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Forces async present to wait for a sync, even while using remote textures.
+
−- name: webgl.out-of-process.async-present.force-sync
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#if defined(MOZ_WIDGET_ANDROID)
+
−- name: webgl.out-of-process.enable-ahardwarebuffer
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−#endif
+
−
+
−# Override the blocklist to assume that GL is threadsafe.
+
−- name: webgl.threadsafe-gl.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−# Override the blocklist to assume that GL is not threadsafe.
+
−- name: webgl.threadsafe-gl.force-disabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−- name: webgl.use-canvas-render-thread
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−- name: webgl.override-unmasked-renderer
+
−  type: DataMutexString
+
−  value: ""
+
−  mirror: always
+
−
+
−- name: webgl.override-unmasked-vendor
+
−  type: DataMutexString
+
−  value: ""
+
−  mirror: always
+
−
+
−- name: webgl.power-preference-override
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: webgl.prefer-16bpp
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.sanitize-unmasked-renderer
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: webgl.allow-immediate-queries
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: webgl.allow-fb-invalidation
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−
+
−- name: webgl.perf.max-warnings
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: webgl.perf.max-acceptable-fb-status-invals
+
−  type: RelaxedAtomicInt32
+
−  value: 0
+
−  mirror: always
+
−
+
−- name: webgl.perf.spew-frame-allocs
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "widget."
+
−#---------------------------------------------------------------------------
+
−
+
−# Global user preference for disabling native theme in content processes.
+
−#
+
−# NOTE(emilio): When changing this make sure to update the non_native_theme
+
−# entry in python/mozbuild/mozbuild/mozinfo.py and test_fission_autostart.py
+
−- name: widget.non-native-theme.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the non-native theme should always use system colors. Useful mostly
+
−# for testing forced colors mode.
+
−- name: widget.non-native-theme.always-high-contrast
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# The style of scrollbars to use. Here are the current options:
+
−#
+
−#   0: Default platform scrollbar style.
+
−#   1: macOS scrollbars
+
−#   2: GTK scrollbars
+
−#   3: Android scrollbars
+
−#   4: Windows 10 scrollbars
+
−#   5: Windows 11 scrollbars
+
−#
+
−# Note that switching to non-default scrollbars is experimental and other
+
−# scrollbar-related prefs may interfere with the experience. For example,
+
−# setting the GTK thumb size may have no effect when using non-GTK scrollbars
+
−# on GTK.
+
−- name: widget.non-native-theme.scrollbar.style
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# An override that allows to override the default platform size. The size in CSS
+
−# pixels at full zoom of the minimum scrollbar width.
+
−- name: widget.non-native-theme.scrollbar.size.override
+
−  type: uint32_t
+
−  value: 0
+
−  mirror: always
+
−
+
−# Whether we should use themed values for dark scrollbars.
+
−- name: widget.non-native-theme.scrollbar.dark-themed
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the active thumb color should always use the themed colors, even if
+
−# dark scrollbars are in use.
+
−- name: widget.non-native-theme.scrollbar.active-always-themed
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we use the Windows CSS scrollbar sizes, or the scrollbar sizes
+
−# defined above.
+
−- name: widget.non-native-theme.win.scrollbar.use-system-size
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether Windows 11 scrollbars are always drawn with the thinner "overlay"
+
−# scrollbar style.
+
−- name: widget.non-native-theme.win11.scrollbar.force-overlay-style
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# The amount of space that the thumb should fill the scrollbar, from zero to
+
−# one.
+
−- name: widget.non-native-theme.gtk.scrollbar.thumb-size
+
−  type: float
+
−  value: 0.75
+
−  mirror: always
+
−
+
−# The minimum size of the scroll thumb, in the scrollbar direction.
+
−- name: widget.non-native-theme.gtk.scrollbar.thumb-cross-size
+
−  type: uint32_t
+
−  value: 40
+
−  mirror: always
+
−
+
−# Whether the thumb should be rounded for the non-native scrollbars.
+
−- name: widget.non-native-theme.gtk.scrollbar.round-thumb
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether buttons shouldn't be suppressed for non-native scrollbars.
+
−- name: widget.non-native-theme.gtk.scrollbar.allow-buttons
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we should use the default accent color or the theme-provided one for
+
−# content (e.g. for form controls and CSS system colors).
+
−#
+
−# Turned off on Windows, for now (we always use the default blue-ish
+
−# accent-color there). We might want to turn this on there, though it's worth
+
−# thinking on what the behavior should be for grey-ish accent colors (which are
+
−# a thing on Windows and can cause confusion with things like disabled form
+
−# controls). Maybe it's just fine.
+
−- name: widget.non-native-theme.use-theme-accent
+
−  type: RelaxedAtomicBool
+
−#ifdef XP_WIN
+
−  value: false
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether we should try to use WebRender to render widgets.
+
−- name: widget.non-native-theme.webrender
+
−  type: bool
+
−#if defined(XP_MACOSX)
+
−  # Disabled on macOS release / beta because of a suspected AMD driver bug (see
+
−  # bug 1715452).
+
−  value: @IS_NIGHTLY_BUILD@
+
−#else
+
−  value: true
+
−#endif
+
−  mirror: always
+
−
+
−# Whether the outline style should be one big stroke or two contrasting strokes
+
−- name: widget.non-native-theme.solid-outline-style
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Preference to disable dark scrollbar implementation.
+
−# This is mainly for testing because dark scrollbars have to be semi-
+
−# transparent, but many reftests expect scrollbars to look identical
+
−# among different backgrounds.
+
−# However, some users may want to disable this as well.
+
−- name: widget.disable-dark-scrollbar
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: widget.window-transforms.disabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−#ifdef XP_MACOSX
+
−
+
−# Whether to shift by the menubar height on fullscreen mode.
+
−# 0: never
+
−# 1: always
+
−# 2: auto (tries to detect when it is needed)
+
−- name: widget.macos.shift-by-menubar-on-fullscreen
+
−  type: RelaxedAtomicUint32
+
−  value: 2
+
−  mirror: always
+
−
+
−- name: widget.macos.native-context-menus
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−#endif
+
−
+
−# Whether native GTK context menus are enabled.
+
−# Disabled because at the very least there's missing custom icon support.
+
−- name: widget.gtk.native-context-menus
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether we use overlay scrollbars on GTK.
+
−- name: widget.gtk.overlay-scrollbars.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we honor the scrollbar colors from the gtk theme.
+
−- name: widget.gtk.theme-scrollbar-colors.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether selection colors for the non-system theme get passed from the system
+
−# GTK theme.
+
−- name: widget.gtk.alt-theme.selection
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether form control accent colors for the non-system theme get passed from
+
−# the system GTK theme.
+
−- name: widget.gtk.alt-theme.accent
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether the scrollbar thumb active color from the non-system theme gets
+
−# passed from the system GTK theme.
+
−- name: widget.gtk.alt-theme.scrollbar_active
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we should try to grab the pointer on popups.
+
−#  0: Never
+
−#  1: Always
+
−#  2: Auto (depending on the system)
+
−- name: widget.gtk.grab-pointer
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether we should try ignore bogus leave-notify events from the window
+
−# manager.
+
−#  0: Never
+
−#  1: Always
+
−#  2: Auto (depending on the system)
+
−- name: widget.gtk.ignore-bogus-leave-notify
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to use gtk high contrast themes to disable content styling like on
+
−# windows high contrast mode.
+
−- name: widget.content.gtk-high-contrast.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−#ifdef MOZ_WAYLAND
+
−# Force fractional scaling using wp_viewporter. Valid values: 0.5 - 8
+
−- name: widget.wayland.fractional_buffer_scale
+
−  type: float
+
−  value: 0.0f
+
−  mirror: once
+
−
+
−# Use opaque region for MozContainer wl_surface
+
−- name: widget.wayland.opaque-region.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Use frame callback based vsync
+
−- name: widget.wayland.vsync.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether to keep firing vsync at layout.throttled_frame_rate after we've been
+
−# occluded.
+
−- name: widget.wayland.vsync.keep-firing-at-idle
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef MOZ_WIDGET_GTK
+
−# Whether to override the DMABuf blocklist.
+
−- name: widget.dmabuf.force-enabled
+
−  type: bool
+
−  value: false
+
−  mirror: once
+
−
+
−#ifdef NIGHTLY_BUILD
+
−# Keep those pref hidden on non-nightly builds to avoid people accidentally
+
−# turning it on.
+
−
+
−# Use DMABuf for content textures.
+
−# For testing purposes only.
+
−- name: widget.dmabuf-textures.enabled
+
−  type: RelaxedAtomicBool
+
−  value: false
+
−  mirror: always
+
−#endif
+
−
+
−# Use DMABuf backend for WebGL.
+
−- name: widget.dmabuf-webgl.enabled
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# Use gdk_window_move_to_rect to move Wayland popups when available.
+
−- name: widget.wayland.use-move-to-rect
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# The time we should spend on a DBUS call to the FileManager1 interface before
+
−# giving up and trying an alternative method.
+
−#
+
−# -1 for the default system timeout, INT_MAX for "infinite time".
+
−#
+
−# This happens right now on the main thread so 1 second should be enough, we
+
−# should consider moving it to a background task and just use the default
+
−# timeout.
+
−- name: widget.gtk.file-manager-show-items-timeout-ms
+
−  type: int32_t
+
−  value: 1000
+
−  mirror: always
+
−
+
−# The timeout we should spend on a DBUS call to the Settings proxy before
+
−# giving up.
+
−#
+
−# -1 for the default system timeout, INT_MAX for "infinite time".
+
−#
+
−# This runs just once, but during startup, so make sure it doesn't take too
+
−# long. Three seconds should be way more than enough, and if we don't get the
+
−# reply on time then the only potential issue is that we use a light instead of
+
−# dark interface or vice versa.
+
−- name: widget.gtk.settings-portal-timeout-ms
+
−  type: int32_t
+
−  value: 3000
+
−  mirror: always
+
−
+
−# Whether to use gtk portal for the file picker.
+
−#  - 0: never
+
−#  - 1: always
+
−#  - 2: auto (true for flatpak or GTK_USE_PORTAL=1, false otherwise)
+
−- name: widget.use-xdg-desktop-portal.file-picker
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to use gtk portal for the mime handler.
+
−#  - 0: never
+
−#  - 1: always
+
−#  - 2: auto (for now only true for flatpak, see bug 1516290)
+
−- name: widget.use-xdg-desktop-portal.mime-handler
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to try to use XDG portal for settings / look-and-feel information.
+
−# https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.Settings
+
−#  - 0: never
+
−#  - 1: always
+
−#  - 2: auto
+
−- name: widget.use-xdg-desktop-portal.settings
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to use XDG portal for geolocation.
+
−# https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.Location
+
−#  - 0: never
+
−#  - 1: always
+
−#  - 2: auto
+
−- name: widget.use-xdg-desktop-portal.location
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−# Whether to use XDG portal for opening to a file.
+
−# https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.OpenURI
+
−#  - 0: never
+
−#  - 1: always
+
−#  - 2: auto (true for flatpak or GTK_USE_PORTAL=1, false otherwise)
+
−- name: widget.use-xdg-desktop-portal.open-uri
+
−  type: int32_t
+
−  value: 2
+
−  mirror: always
+
−#endif
+
−
+
−#ifdef XP_WIN
+
−# WindowsUIUtils::Share to wait for user action on Windows share dialog
+
−# `true` means the promise resolves when user completes or cancels the share
+
−# action. This can be unsafe since selecting copy action fires no DataPackage
+
−# event as of 21H1.
+
−# `false` means the promise resolves when the share data is passed to
+
−# DataPackage.
+
−# This affects the behavior of `navigator.share()`.
+
−- name: widget.windows.share.wait_action.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: widget.windows.window_occlusion_tracking.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether overlay scrollbars respect the system settings.
+
−# Note that these can be overridden by the ui.useOverlayScrollbars pref.
+
−- name: widget.windows.overlay-scrollbars.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we allow accessing the UWP system color pallete.
+
−- name: widget.windows.uwp-system-colors.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−# Whether we use the accent color for highlight as some other UWP apps do.
+
−#
+
−# false for now since it can cause some contrast-with-background issues
+
−# specially with grey accents, see bug 1776588.
+
−- name: widget.windows.uwp-system-colors.highlight-accent
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: widget.windows.window_occlusion_tracking_display_state.enabled
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−- name: widget.windows.window_occlusion_tracking_session_lock.enabled
+
−  type: bool
+
−  value: true
+
−  mirror: always
+
−
+
−- name: widget.windows.hide_cursor_when_typing
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Whether to give explorer.exe a delated nudge to recalculate the fullscreenness
+
−# of a window after maximizing it.
+
−- name: widget.windows.fullscreen_remind_taskbar
+
−  type: RelaxedAtomicBool
+
−  value: true
+
−  mirror: always
+
−
+
−# The number of messages of each type to keep for display in
+
−# about:windows-messages
+
−- name: widget.windows.messages_to_log
+
−  type: RelaxedAtomicUint32
+
−  value: 6
+
−  mirror: always
+
−
+
−# Whether to flush the Ole clipboard synchronously.
+
−# Possible values are:
+
−#  * 0: never
+
−#  * 1: always
+
−#  * 2 (or others): when needed
+
−- name: widget.windows.sync-clipboard-flush
+
−  type: uint32_t
+
−  value: 2
+
−  mirror: always
+
−
+
−# Whether to apply a hack (adjusting the window height by -1px and back again)
+
−# upon first entering fullscreen intended to work around a bug exhibited under
+
−# on some Windows 11 machines under some configurations. (See bug 1763981.)
+
−#
+
−# Semantics:
+
−#  * 0: never
+
−#  * 1: always
+
−#  * 2: auto
+
−- name: widget.windows.apply-dwm-resize-hack
+
−  type: RelaxedAtomicInt32
+
−  value: 2
+
−  mirror: always
+
−#endif
+
−
+
−# Whether to disable SwipeTracker (e.g. swipe-to-nav).
+
−- name: widget.disable-swipe-tracker
+
−  type: bool
+
−  value: false
+
−  mirror: always
+
−
+
−# Various metrics to control SwipeTracker.
+
−- name: widget.swipe.velocity-twitch-tolerance
+
−  type: float
+
−  value: 0.0000001f
+
−  mirror: always
+
−
+
−- name: widget.swipe.success-velocity-contribution
+
−  type: float
+
−  value: 0.05f
+
−  mirror: always
+
−
+
−# The values for this pref are derived from trial and error in an effort to
+
−# match the existing behavior on the respective platforms.
+
−- name: widget.swipe.whole-page-pixel-size
+
−  type: float
+
−#if defined(XP_WIN)
+
−  value: 1100.0f
+
−#elif defined(XP_MACOSX)
+
−  value: 550.0f
+
−#else
+
−  value: 40.0f
+
−#endif
+
−  mirror: always
+
−
+
−- name: widget.transparent-windows
+
−  type: bool
+
−  value: true
+
−  mirror: once
+
−
+
−# Whether the clipboard cached are used while getting system clipboard data.
+
−- name: widget.clipboard.use-cached-data.enabled
+
−  type: bool
+
−#if defined(XP_MACOSX)
+
−  value: true
+
−#else
+
−  value: false
+
−#endif
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# Prefs starting with "zoom."
+
−#---------------------------------------------------------------------------
+
−
+
−- name: zoom.maxPercent
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 400
+
−#else
+
−  value: 500
+
−#endif
+
−  mirror: always
+
−
+
−- name: zoom.minPercent
+
−  type: uint32_t
+
−#ifdef ANDROID
+
−  value: 20
+
−#else
+
−  value: 30
+
−#endif
+
−  mirror: always
+
−
+
−#---------------------------------------------------------------------------
+
−# End of prefs
+
−#---------------------------------------------------------------------------