--- a/browser/app/profile/firefox.js
+++ b/browser/app/profile/firefox.js
@@ -667,20 +667,16 @@ pref("network.protocol-handler.expose.ne
 pref("network.protocol-handler.expose.snews", false);
 pref("network.protocol-handler.expose.nntp", false);
 
 pref("accessibility.typeaheadfind", false);
 pref("accessibility.typeaheadfind.timeout", 5000);
 pref("accessibility.typeaheadfind.linksonly", false);
 pref("accessibility.typeaheadfind.flashBar", 1);
 
-// Accessibility indicator preferences such as support URL, enabled flag.
-pref("accessibility.support.url", "https://support.mozilla.org/%LOCALE%/kb/accessibility-services");
-pref("accessibility.indicator.enabled", true);
-
 // Tracks when accessibility is loaded into the previous session.
 pref("accessibility.loadedInLastSession", false);
 
 pref("plugins.click_to_play", true);
 pref("plugins.testmode", false);
 
 // Should plugins that are hidden show the infobar UI?
 pref("plugins.show_infobar", false);

--- a/browser/base/content/browser.css
+++ b/browser/base/content/browser.css
@@ -283,18 +283,17 @@ toolbarpaletteitem {
 %else
 /* On non-OSX, these should be start-aligned */
 #titlebar-buttonbox-container {
   -moz-box-align: start;
 }
 %endif
 
 %if !defined(MOZ_WIDGET_GTK)
-#TabsToolbar > .private-browsing-indicator,
-#TabsToolbar > .accessibility-indicator {
+#TabsToolbar > .private-browsing-indicator {
   -moz-box-ordinal-group: 1000;
 }
 %endif
 
 %ifdef XP_WIN
 #main-window[sizemode="maximized"] #titlebar-buttonbox {
   -moz-appearance: -moz-window-button-box-maximized;
 }

--- a/browser/base/content/browser.js
+++ b/browser/base/content/browser.js
@@ -1357,17 +1357,16 @@ var gBrowserInit = {
       gURLBar.setAttribute("enablehistory", "false");
     }
 
     // Misc. inits.
     TabletModeUpdater.init();
     CombinedStopReload.init();
     gPrivateBrowsingUI.init();
     BrowserPageActions.init();
-    gAccessibilityServiceIndicator.init();
 
     if (window.matchMedia("(-moz-os-version: windows-win8)").matches &&
         window.matchMedia("(-moz-windows-default-theme)").matches) {
       let windowFrameColor = new Color(...Cu.import("resource:///modules/Windows8WindowFrameColor.jsm", {})
                                             .Windows8WindowFrameColor.get());
       // Default to black for foreground text.
       if (!windowFrameColor.isContrastRatioAcceptable(new Color(0, 0, 0))) {
         document.documentElement.setAttribute("darkwindowframe", "true");
@@ -1844,18 +1843,16 @@ var gBrowserInit = {
     CompactTheme.uninit();
 
     TrackingProtection.uninit();
 
     CaptivePortalWatcher.uninit();
 
     SidebarUI.uninit();
 
-    gAccessibilityServiceIndicator.uninit();
-
     // Now either cancel delayedStartup, or clean up the services initialized from
     // it.
     if (this._boundDelayedStartup) {
       this._cancelDelayedStartup();
     } else {
       if (Win7Features)
         Win7Features.onCloseWindow();
 
@@ -8016,73 +8013,16 @@ function getTabModalPromptBox(aWindow) {
   return null;
 }
 
 /* DEPRECATED */
 function getBrowser() {
   return gBrowser;
 }
 
-const gAccessibilityServiceIndicator = {
-  init() {
-    // Pref to enable accessibility service indicator.
-    gPrefService.addObserver("accessibility.indicator.enabled", this);
-    // Accessibility service init/shutdown event.
-    Services.obs.addObserver(this, "a11y-init-or-shutdown");
-    this.update(Services.appinfo.accessibilityEnabled);
-  },
-
-  update(accessibilityEnabled = false) {
-    if (this.enabled && accessibilityEnabled) {
-      this._active = true;
-      document.documentElement.setAttribute("accessibilitymode", "true");
-      [...document.querySelectorAll(".accessibility-indicator")].forEach(
-        indicator => ["click", "keypress"].forEach(type =>
-          indicator.addEventListener(type, this)));
-      TabsInTitlebar.updateAppearance(true);
-    } else if (this._active) {
-      this._active = false;
-      document.documentElement.removeAttribute("accessibilitymode");
-      [...document.querySelectorAll(".accessibility-indicator")].forEach(
-        indicator => ["click", "keypress"].forEach(type =>
-          indicator.removeEventListener(type, this)));
-      TabsInTitlebar.updateAppearance(true);
-    }
-  },
-
-  observe(subject, topic, data) {
-    if (topic == "nsPref:changed" && data === "accessibility.indicator.enabled") {
-      this.update(Services.appinfo.accessibilityEnabled);
-    } else if (topic === "a11y-init-or-shutdown") {
-      // When "a11y-init-or-shutdown" event is fired, "1" indicates that
-      // accessibility service is started and "0" that it is shut down.
-      this.update(data === "1");
-    }
-  },
-
-  get enabled() {
-    return gPrefService.getBoolPref("accessibility.indicator.enabled");
-  },
-
-  handleEvent({ key, type }) {
-    if ((type === "keypress" && [" ", "Enter"].includes(key)) ||
-         type === "click") {
-      let a11yServicesSupportURL =
-        Services.urlFormatter.formatURLPref("accessibility.support.url");
-      gBrowser.selectedTab = gBrowser.addTab(a11yServicesSupportURL);
-    }
-  },
-
-  uninit() {
-    gPrefService.removeObserver("accessibility.indicator.enabled", this);
-    Services.obs.removeObserver(this, "a11y-init-or-shutdown");
-    this.update();
-  }
-};
-
 var gPrivateBrowsingUI = {
   init: function PBUI_init() {
     // Do nothing for normal windows
     if (!PrivateBrowsingUtils.isWindowPrivate(window)) {
       return;
     }
 
     // Disable the Clear Recent History... menu item when in PB mode

--- a/browser/base/content/browser.xul
+++ b/browser/base/content/browser.xul
@@ -586,30 +586,30 @@
   <box id="appMenu-viewCache" hidden="true"/>
 
 #ifdef CAN_DRAW_IN_TITLEBAR
 <vbox id="titlebar">
   <hbox id="titlebar-content">
     <spacer id="titlebar-spacer" flex="1"/>
     <hbox id="titlebar-buttonbox-container">
 #ifdef XP_WIN
-      <button class="accessibility-indicator" tooltiptext="&accessibilityIndicator.tooltip;" aria-live="polite"/>
-      <hbox class="private-browsing-indicator"/>
+      <hbox id="private-browsing-indicator-titlebar">
+        <hbox class="private-browsing-indicator"/>
+      </hbox>
 #endif
       <hbox id="titlebar-buttonbox">
         <toolbarbutton class="titlebar-button" id="titlebar-min" oncommand="window.minimize();"/>
         <toolbarbutton class="titlebar-button" id="titlebar-max" oncommand="onTitlebarMaxClick();"/>
         <toolbarbutton class="titlebar-button" id="titlebar-close" command="cmd_closeWindow"/>
       </hbox>
     </hbox>
 #ifdef XP_MACOSX
     <!-- OS X does not natively support RTL for its titlebar items, so we prevent this secondary
          buttonbox from reversing order in RTL by forcing an LTR direction. -->
     <hbox id="titlebar-secondary-buttonbox" dir="ltr">
-      <button class="accessibility-indicator" tooltiptext="&accessibilityIndicator.tooltip;" aria-live="polite"/>
       <hbox class="private-browsing-indicator"/>
       <hbox id="titlebar-fullscreen-button"/>
     </hbox>
 #endif
   </hbox>
 </vbox>
 #endif
 
@@ -646,22 +646,18 @@
              customizable="true"
              mode="icons"
              iconsize="small"
              aria-label="&tabsToolbar.label;"
              context="toolbar-context-menu"
              collapsed="true">
 
 #if defined(MOZ_WIDGET_GTK)
-      <hbox class="private-browsing-indicator"
+      <hbox id="private-browsing-indicator"
             skipintoolbarset="true"/>
-      <button class="accessibility-indicator"
-              tooltiptext="&accessibilityIndicator.tooltip;"
-              aria-live="polite"
-              skipintoolbarset="true"/>
 #endif
 
       <tabs id="tabbrowser-tabs"
             class="tabbrowser-tabs"
             tabbrowser="content"
             flex="1"
             setfocus="false"
             tooltip="tabbrowser-tab-tooltip"
@@ -699,18 +695,16 @@
                 label="&newUserContext.label;">
             <menupopup id="alltabs_containersMenuTab" />
           </menu>
           <menuseparator id="alltabs-popup-separator-2"/>
         </menupopup>
       </toolbarbutton>
 
 #if !defined(MOZ_WIDGET_GTK)
-      <button class="accessibility-indicator" tooltiptext="&accessibilityIndicator.tooltip;"
-              aria-live="polite" skipintoolbarset="true"/>
       <hbox class="private-browsing-indicator" skipintoolbarset="true"/>
 #endif
 #ifdef CAN_DRAW_IN_TITLEBAR
       <hbox class="titlebar-placeholder" type="caption-buttons"
             id="titlebar-placeholder-on-TabsToolbar-for-captions-buttons" persist="width"
 #ifndef XP_MACOSX
             ordinal="1000"
 #endif

--- a/browser/base/content/test/alerts/browser.ini
+++ b/browser/base/content/test/alerts/browser.ini
@@ -1,12 +1,13 @@
 [DEFAULT]
 support-files =
   head.js
   file_dom_notifications.html
 
 [browser_notification_close.js]
 skip-if = os == 'win' # Bug 1227785
 [browser_notification_do_not_disturb.js]
+skip-if = (os == 'win' && bits == 32) # Bug 1352791
 [browser_notification_open_settings.js]
 [browser_notification_remove_permission.js]
 [browser_notification_replace.js]
 [browser_notification_tab_switching.js]

--- a/browser/base/content/test/tabcrashed/browser.ini
+++ b/browser/base/content/test/tabcrashed/browser.ini
@@ -1,12 +1,12 @@
 [DEFAULT]
 skip-if = (!e10s || !crashreporter)
 support-files =
   head.js
 
 [browser_autoSubmitRequest.js]
 [browser_clearEmail.js]
 [browser_noPermanentKey.js]
-skip-if = (os == "linux" && bits == 32 && debug) # Bug 1383315
+skip-if = (os == "linux" && debug) # Bug 1383315
 [browser_showForm.js]
 [browser_shown.js]
 [browser_withoutDump.js]

--- a/browser/base/content/test/tabs/browser.ini
+++ b/browser/base/content/test/tabs/browser.ini
@@ -1,15 +1,14 @@
 [DEFAULT]
 support-files =
   dummy_page.html
   test_bug1358314.html
 
 [browser_abandonment_telemetry.js]
-[browser_accessibility_indicator.js]
 [browser_allow_process_switches_despite_related_browser.js]
 [browser_contextmenu_openlink_after_tabnavigated.js]
 [browser_isLocalAboutURI.js]
 [browser_tabCloseProbes.js]
 [browser_tabSpinnerProbe.js]
 skip-if = !e10s # Tab spinner is e10s only.
 [browser_tabSwitchPrintPreview.js]
 skip-if = os == 'mac'

deleted file mode 100644
--- a/browser/base/content/test/tabs/browser_accessibility_indicator.js
+++ /dev/null
@@ -1,124 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-
-"use strict";
-
-const A11Y_INDICATOR_ENABLED_PREF = "accessibility.indicator.enabled";
-
-/**
- * Test various pref and UI properties based on whether the accessibility
- * indicator is enabled and the accessibility service is initialized.
- * @param  {Object}  win      browser window to check the indicator in.
- * @param  {Boolean} enabled  pref flag for accessibility indicator.
- * @param  {Boolean} active   whether accessibility service is started or not.
- */
-function testIndicatorState(win, enabled, active) {
-  is(Services.prefs.getBoolPref(A11Y_INDICATOR_ENABLED_PREF), enabled,
-    `Indicator is ${enabled ? "enabled" : "disabled"}.`);
-  is(Services.appinfo.accessibilityEnabled, active,
-    `Accessibility service is ${active ? "enabled" : "disabled"}.`);
-
-  let visible = enabled && active;
-  is(win.document.documentElement.hasAttribute("accessibilitymode"), visible,
-    `accessibilitymode flag is ${visible ? "set" : "unset"}.`);
-
-  // Browser UI has 2 indicators in markup for OSX and Windows but only 1 is
-  // shown depending on whether the titlebar is enabled.
-  let expectedVisibleCount = visible ? 1 : 0;
-  let visibleCount = 0;
-  [...win.document.querySelectorAll(".accessibility-indicator")].forEach(indicator =>
-    win.getComputedStyle(indicator).getPropertyValue("display") !== "none" &&
-    visibleCount++);
-  is(expectedVisibleCount, visibleCount,
-    `Indicator is ${visible ? "visible" : "invisible"}.`);
-}
-
-/**
- * Instantiate accessibility service and wait for event associated with its
- * startup, if necessary.
- */
-async function initAccessibilityService() {
-  let accService = Cc["@mozilla.org/accessibilityService;1"].getService(
-    Ci.nsIAccessibilityService);
-
-  if (!Services.appinfo.accessibilityEnabled) {
-    await new Promise(resolve => {
-      let observe = (subject, topic, data) => {
-        Services.obs.removeObserver(observe, "a11y-init-or-shutdown");
-        // "1" indicates that the accessibility service is initialized.
-        data === "1" && resolve();
-      };
-      Services.obs.addObserver(observe, "a11y-init-or-shutdown");
-    })
-  }
-
-  return accService;
-}
-
-/**
- * If accessibility service is not yet disabled, wait for the event associated
- * with its shutdown.
- */
-async function shutdownAccessibilityService() {
-  if (Services.appinfo.accessibilityEnabled) {
-    await new Promise(resolve => {
-      let observe = (subject, topic, data) => {
-        Services.obs.removeObserver(observe, "a11y-init-or-shutdown");
-        // "1" indicates that the accessibility service is shutdown.
-        data === "0" && resolve();
-      };
-      Services.obs.addObserver(observe, "a11y-init-or-shutdown");
-    })
-  }
-}
-
-/**
- * Force garbage collection.
- */
-function forceGC() {
-  SpecialPowers.gc();
-  SpecialPowers.forceShrinkingGC();
-  SpecialPowers.forceCC();
-}
-
-add_task(async function test_accessibility_indicator() {
-  info("Test default accessibility indicator state.");
-  let newWin = await BrowserTestUtils.openNewBrowserWindow();
-  testIndicatorState(window, true, false);
-  testIndicatorState(newWin, true, false);
-
-  info("Enable accessibility and ensure the indicator is shown in all windows.");
-  let accService = await initAccessibilityService(); // eslint-disable-line no-unused-vars
-  testIndicatorState(window, true, true);
-  testIndicatorState(newWin, true, true);
-
-  info("Open a new window and ensure the indicator is shown there by default.");
-  let dynamicWin = await BrowserTestUtils.openNewBrowserWindow({ private: true });
-  testIndicatorState(dynamicWin, true, true);
-  await BrowserTestUtils.closeWindow(dynamicWin);
-
-  info("Preff off accessibility indicator.");
-  Services.prefs.setBoolPref(A11Y_INDICATOR_ENABLED_PREF, false);
-  testIndicatorState(window, false, true);
-  testIndicatorState(newWin, false, true);
-  dynamicWin = await BrowserTestUtils.openNewBrowserWindow({ private: true });
-  testIndicatorState(dynamicWin, false, true);
-
-  info("Preff on accessibility indicator.");
-  Services.prefs.setBoolPref(A11Y_INDICATOR_ENABLED_PREF, true);
-  testIndicatorState(window, true, true);
-  testIndicatorState(newWin, true, true);
-  testIndicatorState(dynamicWin, true, true);
-
-  info("Disable accessibility and ensure the indicator is hidden in all windows.");
-  accService = undefined;
-  forceGC();
-  await shutdownAccessibilityService();
-  testIndicatorState(window, true, false);
-  testIndicatorState(newWin, true, false);
-  testIndicatorState(dynamicWin, true, false);
-
-  Services.prefs.clearUserPref(A11Y_INDICATOR_ENABLED_PREF);
-  await BrowserTestUtils.closeWindow(newWin);
-  await BrowserTestUtils.closeWindow(dynamicWin);
-});

--- a/browser/components/preferences/in-content/privacy.js
+++ b/browser/components/preferences/in-content/privacy.js
@@ -1642,17 +1642,18 @@ var gPrivacyPane = {
       case 0: // access allowed
         checkbox.checked = false;
         break;
     }
   },
 
   _initA11yString() {
     let a11yLearnMoreLink =
-      Services.urlFormatter.formatURLPref("accessibility.support.url");
+      Services.urlFormatter.formatURLPref("app.support.baseURL") +
+      "accessibility";
     document.getElementById("a11yLearnMoreLink")
       .setAttribute("href", a11yLearnMoreLink);
   },
 
   updateA11yPrefs(checked) {
     Services.prefs.setIntPref("accessibility.force_disabled", checked ? 1 : 0);
   }
 };

--- a/browser/components/resistfingerprinting/test/browser/browser_navigator.js
+++ b/browser/components/resistfingerprinting/test/browser/browser_navigator.js
@@ -8,17 +8,17 @@ const { classes: Cc, Constructor: CC, in
 const TEST_PATH = "http://example.net/browser/browser/" +
                   "components/resistfingerprinting/test/browser/"
 
 var spoofedUserAgent;
 
 const SPOOFED_APPNAME        = "Netscape";
 const SPOOFED_APPVERSION     = "5.0 (Windows)";
 const SPOOFED_PLATFORM       = "Win64";
-const SPOOFED_OSCPU          = "Windows NT 6.1";
+const SPOOFED_OSCPU          = "Windows NT 6.1; Win64; x64";
 const SPOOFED_BUILDID        = "20100101";
 const SPOOFED_HW_CONCURRENCY = 2;
 
 const CONST_APPCODENAME = "Mozilla";
 const CONST_PRODUCT     = "Gecko";
 const CONST_PRODUCTSUB  = "20100101";
 const CONST_VENDOR      = "";
 const CONST_VENDORSUB   = "";
@@ -87,17 +87,17 @@ async function testWorkerNavigator() {
 add_task(async function setup() {
   await SpecialPowers.pushPrefEnv({"set":
     [["privacy.resistFingerprinting", true]]
   });
 
   let appInfo = Cc["@mozilla.org/xre/app-info;1"].getService(Ci.nsIXULAppInfo);
   let appVersion = parseInt(appInfo.version);
   let spoofedVersion = appVersion - ((appVersion - 3) % 7);
-  spoofedUserAgent = `Mozilla/5.0 (Windows NT 6.1; rv:${spoofedVersion}.0) Gecko/20100101 Firefox/${spoofedVersion}.0`;
+  spoofedUserAgent = `Mozilla/5.0 (${SPOOFED_OSCPU}; rv:${spoofedVersion}.0) Gecko/20100101 Firefox/${spoofedVersion}.0`;
 });
 
 add_task(async function runNavigatorTest() {
   await testNavigator();
 });
 
 add_task(async function runWorkerNavigatorTest() {
   await testWorkerNavigator();

--- a/browser/locales/en-US/chrome/browser/browser.dtd
+++ b/browser/locales/en-US/chrome/browser/browser.dtd
@@ -976,14 +976,8 @@ you can use these alternative items. Oth
 <!ENTITY pageActionButton.tooltip "Page actions">
 <!ENTITY pageAction.addToUrlbar.label "Add to Address Bar">
 <!ENTITY pageAction.removeFromUrlbar.label "Remove from Address Bar">
 
 <!ENTITY pageAction.sendTabToDevice.label "Send Tab to Device">
 <!ENTITY sendToDevice.syncNotReady.label "Syncing Devices…">
 
 <!ENTITY libraryButton.tooltip "View history, saved bookmarks, and more">
-
-<!-- LOCALIZATION NOTE: (accessibilityIndicator.tooltip): This is used to
-     display a tooltip for accessibility indicator in toolbar/tabbar. It is also
-     used as a textual label for the indicator used by assistive technology
-     users. -->
-<!ENTITY accessibilityIndicator.tooltip "Accessibility Features Enabled">

--- a/browser/modules/WindowsJumpLists.jsm
+++ b/browser/modules/WindowsJumpLists.jsm
@@ -511,28 +511,28 @@ this.WinTaskbarJumpList =
 
   /**
    * Notification handlers
    */
 
   notify: function WTBJL_notify(aTimer) {
     // Add idle observer on the first notification so it doesn't hit startup.
     this._updateIdleObserver();
-    this.update();
+    Services.tm.idleDispatchToMainThread(() => { this.update(); });
   },
 
   observe: function WTBJL_observe(aSubject, aTopic, aData) {
     switch (aTopic) {
       case "nsPref:changed":
         if (this._enabled == true && !_prefs.getBoolPref(PREF_TASKBAR_ENABLED))
           this._deleteActiveJumpList();
         this._refreshPrefs();
         this._updateTimer();
         this._updateIdleObserver();
-        this.update();
+        Services.tm.idleDispatchToMainThread(() => { this.update(); });
       break;
 
       case "profile-before-change":
         this._shutdown();
       break;
 
       case "browser:purge-session-history":
         this.update();

--- a/browser/themes/linux/browser.css
+++ b/browser/themes/linux/browser.css
@@ -720,16 +720,22 @@ html|span.ac-emphasize-text-url {
 }
 
 /* Customization mode */
 
 %include ../shared/customizableui/customizeMode.inc.css
 
 /* End customization mode */
 
+
+#main-window[privatebrowsingmode=temporary] #private-browsing-indicator {
+  background: url("chrome://browser/skin/privatebrowsing-mask.png") center no-repeat;
+  width: 40px;
+}
+
 %include ../shared/UITour.inc.css
 
 #UITourHighlight {
   /* Below are some fixes for people without an X compositor on Linux.
      This is why we can't have nice things: */
   /* Animations don't repaint properly without an X compositor. */
   animation-name: none !important;
   /* Opacity rounds to 0 or 1 on Linux without an X compositor, making the

--- a/browser/themes/linux/jar.mn
+++ b/browser/themes/linux/jar.mn
@@ -17,16 +17,17 @@ browser.jar:
   skin/classic/browser/menuPanel-exit@2x.png
   skin/classic/browser/menuPanel-help.png
   skin/classic/browser/menuPanel-help@2x.png
   skin/classic/browser/monitor.png
   skin/classic/browser/monitor_16-10.png
 * skin/classic/browser/pageInfo.css
   skin/classic/browser/pageInfo.png
   skin/classic/browser/page-livemarks.png
+  skin/classic/browser/privatebrowsing-mask.png
   skin/classic/browser/searchbar.css
   skin/classic/browser/setDesktopBackground.css
   skin/classic/browser/slowStartup-16.png
   skin/classic/browser/webRTC-indicator.css  (../shared/webRTC-indicator.css)
 * skin/classic/browser/controlcenter/panel.css        (controlcenter/panel.css)
 * skin/classic/browser/customizableui/panelUI.css (customizableui/panelUI.css)
 * skin/classic/browser/downloads/allDownloadsViewOverlay.css   (downloads/allDownloadsViewOverlay.css)
 * skin/classic/browser/downloads/downloads.css        (downloads/downloads.css)

new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..9eaf3aec7e71bd4d7f3e3d91b47fa3717a17a947
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--- a/browser/themes/osx/browser.css
+++ b/browser/themes/osx/browser.css
@@ -48,39 +48,31 @@
 
 #main-window {
   -moz-appearance: none;
   background-color: #eeeeee;
 }
 
 /** Begin titlebar **/
 
-#titlebar-content {
-  /* Ensure the the content part of the titlebar does not shrink. */
-  min-height: inherit;
-}
-
 #titlebar-buttonbox > .titlebar-button {
   display: none;
 }
 
 /* NB: these would be margin-inline-start/end if it wasn't for the fact that OS X
  * doesn't reverse the order of the items in the titlebar in RTL mode. */
 .titlebar-placeholder[type="caption-buttons"],
 #titlebar-buttonbox {
   margin-left: 7px;
 }
 
-.titlebar-placeholder[type="fullscreen-button"] {
-  margin-right: 4px;
-}
-
+.titlebar-placeholder[type="fullscreen-button"],
 #titlebar-secondary-buttonbox {
-  align-items: center;
-  display: flex;
+  margin-right: 7px;
+  margin-left: 7px;
 }
 
 #main-window:not(:-moz-lwtheme) > #titlebar {
   -moz-appearance: -moz-window-titlebar;
 }
 
 #main-window:not([tabsintitlebar]) > #titlebar {
   height: 22px; /* The native titlebar on OS X is 22px tall. */
@@ -1227,32 +1219,77 @@ html|*.addon-webext-perm-list {
 }
 
 /* Customization mode */
 
 %include ../shared/customizableui/customizeMode.inc.css
 
 /* End customization mode */
 
-/* Private browsing and accessibility indicators */
+.private-browsing-indicator {
+  background-image: url("chrome://browser/skin/privatebrowsing-mask.png");
+  background-repeat: no-repeat;
+  background-size: 100% auto;
+  width: 38px;
+  height: 28px;
+  /**
+   * The private browsing mask graphic has a 3px flare at the top. The distance
+   * we want between the mask and items on either side is 7px, so we use 4px,
+   * since the other 3px is accounted for by the empty space on either side.
+   */
+  margin-left: 4px;
+  margin-right: 4px;
+}
 
-:root[accessibilitymode][tabsintitlebar]:not([inFullscreen]) > #tab-view-deck > #browser-panel > #navigator-toolbox > #TabsToolbar > .accessibility-indicator,
-:root[privatebrowsingmode=temporary][tabsintitlebar]:not([inFullscreen]) > #tab-view-deck > #browser-panel > #navigator-toolbox > #TabsToolbar > .private-browsing-indicator,
-:root[accessibilitymode]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .accessibility-indicator,
-:root[privatebrowsingmode=temporary]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .private-browsing-indicator {
+#titlebar-secondary-buttonbox > .private-browsing-indicator {
+  position: relative;
+}
+
+#main-window[privatebrowsingmode=temporary]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .private-browsing-indicator {
+  background-image: url("chrome://browser/skin/privatebrowsing-mask-short.png");
+  height: 20px;
+}
+
+#main-window:not([privatebrowsingmode=temporary]) .private-browsing-indicator,
+#main-window[privatebrowsingmode=temporary][inFullscreen] > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .private-browsing-indicator,
+#main-window[privatebrowsingmode=temporary]:not([inFullscreen]) > #tab-view-deck > #browser-panel > #navigator-toolbox > #TabsToolbar > .private-browsing-indicator {
   display: none;
 }
 
-#TabsToolbar > .private-browsing-indicator:-moz-locale-dir(rtl),
-#TabsToolbar > .accessibility-indicator:-moz-locale-dir(rtl) {
+@media (min-resolution: 2dppx) {
+  .private-browsing-indicator {
+    background-image: url("chrome://browser/skin/privatebrowsing-mask@2x.png");
+  }
+  #main-window[privatebrowsingmode=temporary]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .private-browsing-indicator {
+    background-image: url("chrome://browser/skin/privatebrowsing-mask-short@2x.png");
+  }
+}
+
+#TabsToolbar > .private-browsing-indicator {
+  /* We offset by 38px for mask graphic, plus 4px to account for the
+   * margin-left, which sums to 42px.
+   */
+  margin-right: -42px;
+}
+
+#main-window[privatebrowsingmode=temporary] .titlebar-placeholder[type="fullscreen-button"],
+#main-window[privatebrowsingmode=temporary] > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > #titlebar-fullscreen-button {
+  margin-left: 0px;
+}
+
+#main-window[privatebrowsingmode=temporary][inFullscreen] .titlebar-placeholder[type="fullscreen-button"] {
+  /* Override display:none for .titlebar-placeholder in fullscreen so we can have consistent
+     position and padding for the private browsing indicator. */
+  display: -moz-box;
+}
+
+#TabsToolbar > .private-browsing-indicator:-moz-locale-dir(rtl) {
   -moz-box-ordinal-group: 0;
 }
 
-/* End private browsing and accessibility indicators */
-
 %include ../shared/UITour.inc.css
 
 #UITourTooltipDescription {
   font-size: 1.18rem;
   line-height: 2rem;
 }
 
 #UITourTooltipClose {

--- a/browser/themes/osx/jar.mn
+++ b/browser/themes/osx/jar.mn
@@ -22,16 +22,20 @@ browser.jar:
   skin/classic/browser/panel-expander-closed.png
   skin/classic/browser/panel-expander-closed@2x.png
   skin/classic/browser/panel-expander-open.png
   skin/classic/browser/panel-expander-open@2x.png
   skin/classic/browser/panel-plus-sign.png
   skin/classic/browser/page-livemarks.png
   skin/classic/browser/page-livemarks@2x.png
   skin/classic/browser/pageInfo.css
+  skin/classic/browser/privatebrowsing-mask.png
+  skin/classic/browser/privatebrowsing-mask@2x.png
+  skin/classic/browser/privatebrowsing-mask-short.png
+  skin/classic/browser/privatebrowsing-mask-short@2x.png
   skin/classic/browser/searchbar.css
   skin/classic/browser/slowStartup-16.png
   skin/classic/browser/toolbarbutton-dropmarker.png
   skin/classic/browser/toolbarbutton-dropmarker@2x.png
   skin/classic/browser/webRTC-indicator.css
 * skin/classic/browser/controlcenter/panel.css        (controlcenter/panel.css)
 * skin/classic/browser/customizableui/panelUI.css    (customizableui/panelUI.css)
 * skin/classic/browser/downloads/allDownloadsViewOverlay.css (downloads/allDownloadsViewOverlay.css)

new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..92f60e29f9fd71ed62101b7f7f22ea37423387a0
GIT binary patch
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new file mode 100644
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--- a/browser/themes/shared/browser.inc.css
+++ b/browser/themes/shared/browser.inc.css
@@ -65,48 +65,8 @@
 #library-animatable-box {
   display: none;
 }
 
 #library-animatable-box[animate] {
   display: -moz-box;
 }
 
-/* Private browsing and accessibility indicators */
-
-.accessibility-indicator,
-.private-browsing-indicator {
-  background-repeat: no-repeat;
-  background-size: 100% auto;
-  background-position: center;
-  width: 24px;
-  height: 24px;
-  margin-left: 8px;
-  margin-right: 8px;
-}
-
-.accessibility-indicator {
-  background-image: url("chrome://browser/skin/accessibility.svg");
-  -moz-user-focus: normal;
-  /* Clear default button styling */
-  -moz-appearance: none;
-  margin-top: unset;
-  margin-bottom: unset;
-  min-width: unset;
-  color: unset;
-  text-shadow: unset;
-}
-
-.accessibility-indicator:-moz-any(:hover, :active, :focus, :-moz-focusring) {
-  background-image: url("chrome://browser/skin/accessibility-active.svg");
-  outline: 0;
-}
-
-.private-browsing-indicator {
-  background-image: url("chrome://browser/skin/private-browsing.svg");
-}
-
-:root:not([accessibilitymode]) .accessibility-indicator,
-:root:not([privatebrowsingmode=temporary]) .private-browsing-indicator {
-  display: none;
-}
-
-/* End private browsing and accessibility indicators */

deleted file mode 100644
--- a/browser/themes/shared/icons/accessibility-active.svg
+++ /dev/null
@@ -1,10 +0,0 @@
-<!-- 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/. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="24px" height="24px">
-<path fill="#008EA4" fill-opacity="0.9886" d="M12,24L12,24C5.4,24,0,18.6,0,12l0,0C0,5.4,5.4,0,12,0l0,0c6.6,0,12,5.4,12,12l0,0  C24,18.6,18.6,24,12,24z"/>
-<g>
-	<circle fill="#FFFFFF" cx="12" cy="6" r="2"/>
-	<path fill="#FFFFFF" d="M18.1,8.5h-3.6l0,0h-5l0,0H6c-0.6,0-1,0.4-1,1s0.4,1,1,1h3.5v0.6l0,0v7.8c0,0.6,0.4,1.1,1,1.1s1-0.5,1-1.1   v-4.1h1v4.1c0,0.6,0.4,1.1,1,1.1s1-0.5,1-1.1v-4.1l0,0v-4.5H18c0.6,0,1-0.4,1-1C19,8.8,18.6,8.5,18.1,8.5z"/>
-</g>
-</svg>
\ No newline at end of file

deleted file mode 100644
--- a/browser/themes/shared/icons/accessibility.svg
+++ /dev/null
@@ -1,11 +0,0 @@
-<!-- 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/. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="24px" height="24px">
-<path fill="#00C8D7" fill-opacity="0.9886" d="M12,24L12,24C5.4,24,0,18.6,0,12l0,0C0,5.4,5.4,0,12,0l0,0c6.6,0,12,5.4,12,12l0,0  C24,18.6,18.6,24,12,24z"/>
-<g>
-	<circle fill="#FFFFFF" cx="12" cy="6" r="2"/>
-	<path fill="#FFFFFF" d="M18.1,8.5h-3.6l0,0h-5l0,0H6c-0.6,0-1,0.4-1,1c0,0.6,0.4,1,1,1h3.5v0.6l0,0v7.8c0,0.6,0.4,1.1,1,1.1s1-0.5,1-1.1
-  v-4.1h1v4.1c0,0.6,0.4,1.1,1,1.1s1-0.5,1-1.1v-4.1l0,0v-4.5H18c0.6,0,1-0.4,1-1C19,8.8,18.6,8.5,18.1,8.5z"/>
-</g>
-</svg>

deleted file mode 100644
--- a/browser/themes/shared/icons/private-browsing.svg
+++ /dev/null
@@ -1,11 +0,0 @@
-<!-- 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/. -->
-<svg xmlns="http://www.w3.org/2000/svg" width="24px" height="24px">
-<path fill="#8000D7" d="M12,24L12,24C5.4,24,0,18.6,0,12l0,0C0,5.4,5.4,0,12,0l0,0c6.6,0,12,5.4,12,12l0,0
-	C24,18.6,18.6,24,12,24z"/>
-<path fill="#FFFFFF" d="M15.4,11c-1-0.1-1.9,0.5-2.1,1.5c0,0.3,1.2,0.7,2.3,0.7s2.1-0.7,2.1-0.9C17.7,12.1,17,11.1,15.4,11
-	L15.4,11z M8.6,11c-1.6,0.1-2.3,1-2.3,1.3c0,0.2,1.1,0.9,2.1,0.9c1,0,2.3-0.4,2.3-0.7C10.5,11.5,9.5,10.9,8.6,11L8.6,11z M16.4,16.5
-	c-1.7,0-2.8-2-4.4-2c-1.6,0-2.8,2-4.4,2c-2.1,0-3.6-1.9-3.6-5.3c0-2.1,0.6-2.7,3.3-2.7s3.4,1.1,4.7,1.1s2.1-1.1,4.7-1.1
-	S20,9.2,20,11.2C20,14.6,18.5,16.5,16.4,16.5L16.4,16.5z"/>
-</svg>

--- a/browser/themes/shared/jar.inc.mn
+++ b/browser/themes/shared/jar.inc.mn
@@ -107,18 +107,16 @@
   skin/classic/browser/preferences/in-content/sync-devices.svg (../shared/incontentprefs/sync-devices.svg)
   skin/classic/browser/preferences/in-content/sync.svg         (../shared/incontentprefs/sync.svg)
 * skin/classic/browser/preferences/in-content/containers.css   (../shared/incontentprefs/containers.css)
 * skin/classic/browser/preferences/containers.css              (../shared/preferences/containers.css)
   skin/classic/browser/fxa/default-avatar.svg                  (../shared/fxa/default-avatar.svg)
   skin/classic/browser/fxa/sync-illustration.svg               (../shared/fxa/sync-illustration.svg)
 
 
-  skin/classic/browser/accessibility.svg              (../shared/icons/accessibility.svg)
-  skin/classic/browser/accessibility-active.svg       (../shared/icons/accessibility-active.svg)
   skin/classic/browser/arrow-left.svg                 (../shared/icons/arrow-left.svg)
   skin/classic/browser/back.svg                       (../shared/icons/back.svg)
   skin/classic/browser/back-12.svg                    (../shared/icons/back-12.svg)
   skin/classic/browser/bookmark.svg                   (../shared/icons/bookmark.svg)
   skin/classic/browser/bookmark-animation.svg         (../shared/icons/bookmark-animation.svg)
   skin/classic/browser/bookmark-hollow.svg            (../shared/icons/bookmark-hollow.svg)
   skin/classic/browser/bookmark-star-on-tray.svg      (../shared/icons/bookmark-star-on-tray.svg)
   skin/classic/browser/characterEncoding.svg          (../shared/icons/characterEncoding.svg)
@@ -150,17 +148,16 @@
   skin/classic/browser/link.svg                       (../shared/icons/link.svg)
   skin/classic/browser/mail.svg                       (../shared/icons/mail.svg)
   skin/classic/browser/menu.svg                       (../shared/icons/menu.svg)
   skin/classic/browser/new-tab.svg                    (../shared/icons/new-tab.svg)
   skin/classic/browser/new-window.svg                 (../shared/icons/new-window.svg)
   skin/classic/browser/open.svg                       (../shared/icons/open.svg)
   skin/classic/browser/page-action.svg                (../shared/icons/page-action.svg)
   skin/classic/browser/print.svg                      (../shared/icons/print.svg)
-  skin/classic/browser/private-browsing.svg           (../shared/icons/private-browsing.svg)
   skin/classic/browser/privateBrowsing.svg            (../shared/icons/privateBrowsing.svg)
   skin/classic/browser/restore-session.svg            (../shared/icons/restore-session.svg)
   skin/classic/browser/quit.svg                       (../shared/icons/quit.svg)
   skin/classic/browser/reload.svg                     (../shared/icons/reload.svg)
   skin/classic/browser/reload-to-stop.svg             (../shared/icons/reload-to-stop.svg)
   skin/classic/browser/save.svg                       (../shared/icons/save.svg)
   skin/classic/browser/settings.svg                   (../shared/icons/settings.svg)
   skin/classic/browser/sidebars.svg                   (../shared/icons/sidebars.svg)

--- a/browser/themes/windows/browser.css
+++ b/browser/themes/windows/browser.css
@@ -229,22 +229,16 @@
  * window state. Otherwise, elements in the navigator-toolbox, like the menubar,
  * can swallow those events. It will also place the buttons above the fog on
  * Windows 7 with Aero Glass.
  */
 #titlebar-buttonbox {
   z-index: 1;
 }
 
-#titlebar-buttonbox,
-#titlebar-buttonbox-container {
-  display: flex;
-  align-items: center;
-}
-
 .titlebar-placeholder[type="caption-buttons"] {
   margin-left: 22px; /* space needed for Aero Snap */
 }
 
 /* titlebar command buttons */
 
 #titlebar-min {
   -moz-appearance: -moz-window-button-minimize;
@@ -1082,36 +1076,99 @@ notification[value="translation"] {
 }
 
 #customization-tipPanel > .panel-arrowcontainer > .panel-arrowbox > .panel-arrow[side="right"] {
   margin-left: -2px;
 }
 
 /* End customization mode */
 
-/* Private browsing and accessibility indicators */
+/* Private browsing indicators */
+
+/**
+ * Currently, we have two places where we put private browsing indicators on
+ * Windows. When tabsintitlebar is enabled, we draw the indicator in the titlebar.
+ * When tabsintitlebar is disabled, we draw the indicator at the end of the
+ * tabstrip. The titlebar indicator is the fiddliest of the bunch, since we
+ * want the bottom border of the image to line up with the bottom of the window
+ * caption buttons. That's why there's so much special-casing going on in here.
+ */
+.private-browsing-indicator {
+  display: none;
+  pointer-events: none;
+}
 
-:root:-moz-any([tabsintitlebar], [inFullscreen]):not([privatebrowsingmode=temporary]) .accessibility-indicator,
-:root:-moz-any([tabsintitlebar], [inFullscreen]) .private-browsing-indicator {
-  margin-inline-end: 12px;
+#private-browsing-indicator-titlebar {
+  display: block;
+  position: absolute;
+}
+
+#main-window[privatebrowsingmode=temporary][tabsintitlebar] #private-browsing-indicator-titlebar > .private-browsing-indicator {
+  display: block;
+}
+
+#main-window[privatebrowsingmode=temporary]:-moz-any([inFullscreen],:not([tabsintitlebar])) #TabsToolbar > .private-browsing-indicator {
+  display: -moz-box;
+}
+
+#TabsToolbar > .private-browsing-indicator {
+  background: url("chrome://browser/skin/privatebrowsing-mask-tabstrip.png") no-repeat center -3px;
+  margin-inline-start: 4px;
+  width: 48px;
 }
 
-:root:not([accessibilitymode]) .private-browsing-indicator,
-.accessibility-indicator {
-  margin-inline-start: 12px;
+/* Bug 1008183: We're intentionally using the titlebar asset here for fullscreen
+ * mode, since the tabstrip "mimics" the titlebar in that case with its own
+ * min/max/close window buttons.
+ */
+#private-browsing-indicator-titlebar > .private-browsing-indicator,
+#main-window[inFullscreen] #TabsToolbar > .private-browsing-indicator {
+  background: url("chrome://browser/skin/privatebrowsing-mask-titlebar.png") no-repeat center 0px;
+  margin-inline-end: 4px;
+  width: 40px;
+  height: 20px;
+  position: relative;
+}
+
+@media (-moz-windows-classic) {
+  /**
+   * We have to use top instead of background-position in this case, otherwise
+   * the bottom of the indicator would get cut off by the bounds of the
+   * private-browsing-indicator element.
+   */
+  #main-window[sizemode="normal"] > #titlebar > #titlebar-content > #titlebar-buttonbox-container > #private-browsing-indicator-titlebar > .private-browsing-indicator {
+    top: 4px;
+  }
 }
 
-:root[accessibilitymode][tabsintitlebar]:not([inFullscreen]) > #tab-view-deck > #browser-panel > #navigator-toolbox > #TabsToolbar > .accessibility-indicator,
-:root[privatebrowsingmode=temporary][tabsintitlebar]:not([inFullscreen]) > #tab-view-deck > #browser-panel > #navigator-toolbox > #TabsToolbar > .private-browsing-indicator,
-:root[accessibilitymode]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .accessibility-indicator,
-:root[privatebrowsingmode=temporary]:not([tabsintitlebar]) > #titlebar > #titlebar-content > #titlebar-secondary-buttonbox > .private-browsing-indicator {
-  display: none;
+@media (-moz-os-version: windows-win7) {
+  @media (-moz-windows-glass) {
+    #main-window[sizemode="normal"] > #titlebar > #titlebar-content > #titlebar-buttonbox-container > #private-browsing-indicator-titlebar > .private-browsing-indicator {
+      top: 1px;
+    }
+    #main-window[sizemode="maximized"] > #titlebar > #titlebar-content > #titlebar-buttonbox-container > #private-browsing-indicator-titlebar > .private-browsing-indicator {
+      top: -1px;
+    }
+  }
+
+  /**
+   * This next block targets Aero Basic, which has different positioning for the
+   * window caption buttons, and therefore needs to be special-cased.
+   */
+  @media (-moz-windows-default-theme) {
+    @media (-moz-windows-compositor: 0) {
+      #main-window[sizemode="normal"] > #titlebar > #titlebar-content > #titlebar-buttonbox-container > #private-browsing-indicator-titlebar > .private-browsing-indicator {
+        background-image: url("chrome://browser/skin/privatebrowsing-mask-titlebar-win7-tall.png");
+        height: 28px;
+      }
+    }
+  }
 }
 
-/* End private browsing and accessibility indicators */
+/* End private browsing indicators */
 
 %include ../shared/UITour.inc.css
 
 #UITourTooltipButtons {
   /**
    * Override the --arrowpanel-padding so the background extends
    * to the sides and bottom of the panel.
    */

--- a/browser/themes/windows/jar.mn
+++ b/browser/themes/windows/jar.mn
@@ -18,16 +18,21 @@ browser.jar:
   skin/classic/browser/menuPanel-exit.png
   skin/classic/browser/menuPanel-exit@2x.png
   skin/classic/browser/menuPanel-help.png
   skin/classic/browser/menuPanel-help@2x.png
   skin/classic/browser/monitor.png
   skin/classic/browser/monitor_16-10.png
   skin/classic/browser/pageInfo.css
   skin/classic/browser/pageInfo.png
+  skin/classic/browser/privatebrowsing-mask-tabstrip.png
+  skin/classic/browser/privatebrowsing-mask-tabstrip-win7.png
+  skin/classic/browser/privatebrowsing-mask-titlebar.png
+  skin/classic/browser/privatebrowsing-mask-titlebar-win7.png
+  skin/classic/browser/privatebrowsing-mask-titlebar-win7-tall.png
   skin/classic/browser/searchbar.css
   skin/classic/browser/setDesktopBackground.css
   skin/classic/browser/slowStartup-16.png
   skin/classic/browser/sync-desktopIcon.svg  (../shared/sync-desktopIcon.svg)
   skin/classic/browser/sync-mobileIcon.svg  (../shared/sync-mobileIcon.svg)
   skin/classic/browser/toolbarbutton-dropdown-arrow-win7.png
   skin/classic/browser/webRTC-indicator.css  (../shared/webRTC-indicator.css)
 * skin/classic/browser/controlcenter/panel.css                 (controlcenter/panel.css)
@@ -84,9 +89,11 @@ browser.jar:
 
 [extensions/{972ce4c6-7e08-4474-a285-3208198ce6fd}] chrome.jar:
 % override chrome://browser/skin/page-livemarks.png                   chrome://browser/skin/feeds/feedIcon16.png
 % override chrome://browser/skin/feeds/audioFeedIcon.png              chrome://browser/skin/feeds/feedIcon.png
 % override chrome://browser/skin/feeds/audioFeedIcon16.png            chrome://browser/skin/feeds/feedIcon16.png
 % override chrome://browser/skin/feeds/videoFeedIcon.png              chrome://browser/skin/feeds/feedIcon.png
 % override chrome://browser/skin/feeds/videoFeedIcon16.png            chrome://browser/skin/feeds/feedIcon16.png
 
+% override chrome://browser/skin/privatebrowsing-mask-tabstrip.png    chrome://browser/skin/privatebrowsing-mask-tabstrip-win7.png  os=WINNT osversion<=6.1
+% override chrome://browser/skin/privatebrowsing-mask-titlebar.png    chrome://browser/skin/privatebrowsing-mask-titlebar-win7.png  os=WINNT osversion<=6.1
 % override chrome://browser/skin/toolbarbutton-dropdown-arrow.png     chrome://browser/skin/toolbarbutton-dropdown-arrow-win7.png   os=WINNT osversion<=6.1

new file mode 100644
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GIT binary patch
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index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..4a723c54e2316e978062be38a7be8eaa1a0d11f2
GIT binary patch
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new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..835912b534b2d16ac01a52c44ff6f3548ac0032c
GIT binary patch
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new file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..111dc7d04167c3767538fb6b64e34717fb259ef0
GIT binary patch
literal 370
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--- a/dom/base/Selection.cpp
+++ b/dom/base/Selection.cpp
@@ -918,16 +918,29 @@ Selection::FocusOffset()
 
   if (GetDirection() == eDirNext){
     return mAnchorFocusRange->EndOffset();
   }
 
   return mAnchorFocusRange->StartOffset();
 }
 
+nsIContent*
+Selection::GetChildAtAnchorOffset()
+{
+  if (!mAnchorFocusRange)
+    return nullptr;
+
+  if (GetDirection() == eDirNext) {
+    return mAnchorFocusRange->GetChildAtStartOffset();
+  }
+
+  return mAnchorFocusRange->GetChildAtEndOffset();
+}
+
 static nsresult
 CompareToRangeStart(nsINode* aCompareNode, int32_t aCompareOffset,
                     nsRange* aRange, int32_t* aCmp)
 {
   nsINode* start = aRange->GetStartContainer();
   NS_ENSURE_STATE(aCompareNode && start);
   // If the nodes that we're comparing are not in the same document,
   // assume that aCompareNode will fall at the end of the ranges.

--- a/dom/base/Selection.h
+++ b/dom/base/Selection.h
@@ -166,16 +166,18 @@ public:
   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
 
   // WebIDL methods
   nsINode*     GetAnchorNode();
   uint32_t     AnchorOffset();
   nsINode*     GetFocusNode();
   uint32_t     FocusOffset();
 
+  nsIContent*  GetChildAtAnchorOffset();
+
   /*
    * IsCollapsed -- is the whole selection just one point, or unset?
    */
   bool IsCollapsed() const
   {
     uint32_t cnt = mRanges.Length();
     if (cnt == 0) {
       return true;

--- a/dom/base/nsDocument.cpp
+++ b/dom/base/nsDocument.cpp
@@ -3011,23 +3011,24 @@ nsDocument::InitCSP(nsIChannel* aChannel
   // The document may already have some sandbox flags set (e.g. if the document
   // is an iframe with the sandbox attribute set). If we have a CSP sandbox
   // directive, intersect the CSP sandbox flags with the existing flags. This
   // corresponds to the _least_ permissive policy.
   uint32_t cspSandboxFlags = SANDBOXED_NONE;
   rv = csp->GetCSPSandboxFlags(&cspSandboxFlags);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  mSandboxFlags |= cspSandboxFlags;
-
   // Probably the iframe sandbox attribute already caused the creation of a
   // new NullPrincipal. Only create a new NullPrincipal if CSP requires so
   // and no one has been created yet.
   bool needNewNullPrincipal =
     (cspSandboxFlags & SANDBOXED_ORIGIN) && !(mSandboxFlags & SANDBOXED_ORIGIN);
+
+  mSandboxFlags |= cspSandboxFlags;
+  
   if (needNewNullPrincipal) {
     principal = NullPrincipal::CreateWithInheritedAttributes(principal);
     principal->SetCsp(csp);
     SetPrincipal(principal);
   }
 
   // ----- Enforce frame-ancestor policy on any applied policies
   nsCOMPtr<nsIDocShell> docShell(mDocumentContainer);

--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -2391,16 +2391,17 @@ NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ns
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mOuterWindow)
   }
 
   if (tmp->mListenerManager) {
     tmp->mListenerManager->Disconnect();
     NS_IMPL_CYCLE_COLLECTION_UNLINK(mListenerManager)
   }
 
+  tmp->UpdateTopInnerWindow();
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mTopInnerWindow)
 
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mLocation)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mHistory)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mCustomElements)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mLocalStorage)
   NS_IMPL_CYCLE_COLLECTION_UNLINK(mSessionStorage)
   if (tmp->mApplicationCache) {
@@ -2622,17 +2623,20 @@ nsGlobalWindow::SetInitialPrincipalToSub
     // NullPrincipal.
     bool isNullPrincipal;
     MOZ_ASSERT(NS_SUCCEEDED(mDoc->NodePrincipal()->GetIsNullPrincipal(&isNullPrincipal)) &&
                isNullPrincipal);
 #endif
   }
 
   GetDocShell()->CreateAboutBlankContentViewer(newWindowPrincipal);
-  mDoc->SetIsInitialDocument(true);
+
+  if (mDoc) {
+    mDoc->SetIsInitialDocument(true);
+  }
 
   nsCOMPtr<nsIPresShell> shell = GetDocShell()->GetPresShell();
 
   if (shell && !shell->DidInitialize()) {
     // Ensure that if someone plays with this document they will get
     // layout happening.
     nsRect r = shell->GetPresContext()->GetVisibleArea();
     shell->Initialize(r.Width(), r.Height());
@@ -4376,16 +4380,27 @@ nsPIDOMWindowInner::Thaw()
 
 void
 nsPIDOMWindowInner::SyncStateFromParentWindow()
 {
   nsGlobalWindow::Cast(this)->SyncStateFromParentWindow();
 }
 
 void
+nsGlobalWindow::UpdateTopInnerWindow()
+{
+  if (!IsInnerWindow() || AsInner()->IsTopInnerWindow()) {
+    return;
+  }
+
+  AsInner()->UpdateWebSocketCount(-(int32_t)mNumOfOpenWebSockets);
+  AsInner()->UpdateUserMediaCount(-(int32_t)mNumOfActiveUserMedia);
+}
+
+void
 nsPIDOMWindowInner::AddPeerConnection()
 {
   MOZ_ASSERT(NS_IsMainThread());
   MOZ_ASSERT(IsInnerWindow());
   mTopInnerWindow ? mTopInnerWindow->mActivePeerConnections++
                   : mActivePeerConnections++;
 }
 
@@ -4514,48 +4529,52 @@ void
 nsPIDOMWindowInner::UpdateWebSocketCount(int32_t aDelta)
 {
   MOZ_ASSERT(NS_IsMainThread());
 
   if (aDelta == 0) {
     return;
   }
 
-  uint32_t& counter = mTopInnerWindow ? mTopInnerWindow->mNumOfOpenWebSockets
-                                      : mNumOfOpenWebSockets;
-
-  MOZ_DIAGNOSTIC_ASSERT(aDelta > 0 || ((aDelta + counter) < counter));
-
-  counter += aDelta;
+  if (!IsTopInnerWindow()) {
+    mTopInnerWindow->UpdateWebSocketCount(aDelta);
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(
+    aDelta > 0 || ((aDelta + mNumOfOpenWebSockets) < mNumOfOpenWebSockets));
+
+  mNumOfOpenWebSockets += aDelta;
 }
 
 bool
 nsPIDOMWindowInner::HasOpenWebSockets() const
 {
   MOZ_ASSERT(NS_IsMainThread());
 
-  return (mTopInnerWindow ? mTopInnerWindow->mNumOfOpenWebSockets
-                          : mNumOfOpenWebSockets) > 0;
+  return mNumOfOpenWebSockets ||
+         (mTopInnerWindow && mTopInnerWindow->mNumOfOpenWebSockets);
 }
 
 void
 nsPIDOMWindowInner::UpdateUserMediaCount(int32_t aDelta)
 {
   MOZ_ASSERT(NS_IsMainThread());
 
   if (aDelta == 0) {
     return;
   }
 
-  uint32_t& counter = mTopInnerWindow ? mTopInnerWindow->mNumOfActiveUserMedia
-                                      : mNumOfActiveUserMedia;
-
-  MOZ_DIAGNOSTIC_ASSERT(aDelta > 0 || ((aDelta + counter) < counter));
-
-  counter += aDelta;
+  if (!IsTopInnerWindow()) {
+    mTopInnerWindow->UpdateUserMediaCount(aDelta);
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(
+    aDelta > 0 || ((aDelta + mNumOfActiveUserMedia) < mNumOfActiveUserMedia));
+
+  mNumOfActiveUserMedia += aDelta;
 }
 
 bool
 nsPIDOMWindowInner::HasActiveUserMedia() const
 {
   return (mTopInnerWindow ? mTopInnerWindow->mNumOfActiveUserMedia
                           : mNumOfActiveUserMedia) > 0;
 }

--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -1314,16 +1314,18 @@ public:
                     JS::MutableHandle<JS::Value> aRetval,
                     mozilla::ErrorResult& aError);
 
   already_AddRefed<nsWindowRoot> GetWindowRootOuter();
   already_AddRefed<nsWindowRoot> GetWindowRoot(mozilla::ErrorResult& aError);
 
   mozilla::dom::Performance* GetPerformance();
 
+  void UpdateTopInnerWindow();
+
 protected:
   // Web IDL helpers
 
   // Redefine the property called aPropName on this window object to be a value
   // property with the value aValue, much like we would do for a [Replaceable]
   // property in IDL.
   void RedefineProperty(JSContext* aCx, const char* aPropName,
                         JS::Handle<JS::Value> aValue,

--- a/dom/base/nsJSEnvironment.cpp
+++ b/dom/base/nsJSEnvironment.cpp
@@ -1779,22 +1779,30 @@ nsJSContext::EndCycleCollectionCallback(
 }
 
 // static
 bool
 InterSliceGCRunnerFired(TimeStamp aDeadline, void* aData)
 {
   nsJSContext::KillInterSliceGCRunner();
   MOZ_ASSERT(sActiveIntersliceGCBudget > 0);
-  // We use longer budgets when timer runs since that means
-  // there hasn't been idle time recently and we may have significant amount
-  // garbage to collect.
-  int64_t budget = sActiveIntersliceGCBudget * 2;
-  if (!aDeadline.IsNull()) {
-    budget = int64_t((aDeadline - TimeStamp::Now()).ToMilliseconds());
+  // We use longer budgets when the CC has been locked out but the CC has tried
+  // to run since that means we may have significant amount garbage to collect
+  // and better to GC in several longer slices than in a very long one.
+  int64_t budget = aDeadline.IsNull() ?
+    int64_t(sActiveIntersliceGCBudget) :
+    int64_t((aDeadline - TimeStamp::Now()).ToMilliseconds());
+  if (sCCLockedOut && sCCLockedOutTime) {
+    int64_t lockedTime = PR_Now() - sCCLockedOutTime;
+    int32_t maxSliceGCBudget = sActiveIntersliceGCBudget * 10;
+    double percentOfLockedTime =
+      std::min((double)lockedTime / NS_MAX_CC_LOCKEDOUT_TIME, 1.0);
+    budget =
+      static_cast<int64_t>(
+        std::max((double)budget, percentOfLockedTime * maxSliceGCBudget));
   }
 
   TimeStamp startTimeStamp = TimeStamp::Now();
   TimeDuration duration = sGCUnnotifiedTotalTime;
   uintptr_t reason = reinterpret_cast<uintptr_t>(aData);
   nsJSContext::GarbageCollectNow(aData ?
                                    static_cast<JS::gcreason::Reason>(reason) :
                                    JS::gcreason::INTER_SLICE_GC,

--- a/dom/base/nsPIDOMWindow.h
+++ b/dom/base/nsPIDOMWindow.h
@@ -781,16 +781,19 @@ public:
   // window of that outer.
   inline bool IsCurrentInnerWindow() const;
 
   // Returns true if the document of this window is the active document.  This
   // is not identical to IsCurrentInnerWindow() because document.open() will
   // keep the same document active but create a new window.
   inline bool HasActiveDocument();
 
+  // Returns true if this window is the same as mTopInnerWindow
+  inline bool IsTopInnerWindow() const;
+
   bool AddAudioContext(mozilla::dom::AudioContext* aAudioContext);
   void RemoveAudioContext(mozilla::dom::AudioContext* aAudioContext);
   void MuteAudioContexts();
   void UnmuteAudioContexts();
 
   bool GetAudioCaptured() const;
   nsresult SetAudioCapture(bool aCapture);
 

--- a/dom/base/nsPIDOMWindowInlines.h
+++ b/dom/base/nsPIDOMWindowInlines.h
@@ -94,16 +94,22 @@ bool
 nsPIDOMWindowInner::HasActiveDocument()
 {
   return IsCurrentInnerWindow() ||
     (mOuterWindow &&
      mOuterWindow->GetCurrentInnerWindow() &&
      mOuterWindow->GetCurrentInnerWindow()->GetDoc() == mDoc);
 }
 
+bool
+nsPIDOMWindowInner::IsTopInnerWindow() const
+{
+  return mTopInnerWindow == this;
+}
+
 template <class T>
 nsIDocShell*
 nsPIDOMWindow<T>::GetDocShell() const
 {
   if (mOuterWindow) {
     return mOuterWindow->GetDocShell();
   }
 

--- a/dom/base/nsRange.h
+++ b/dom/base/nsRange.h
@@ -97,16 +97,26 @@ public:
     return static_cast<uint32_t>(mStart.Offset());
   }
 
   uint32_t EndOffset() const
   {
     return static_cast<uint32_t>(mEnd.Offset());
   }
 
+  nsIContent* GetChildAtStartOffset() const
+  {
+    return mStart.GetChildAtOffset();
+  }
+
+  nsIContent* GetChildAtEndOffset() const
+  {
+    return mEnd.GetChildAtOffset();
+  }
+
   bool IsPositioned() const
   {
     return mIsPositioned;
   }
 
   void SetMaySpanAnonymousSubtrees(bool aMaySpanAnonymousSubtrees)
   {
     mMaySpanAnonymousSubtrees = aMaySpanAnonymousSubtrees;

--- a/dom/cache/CacheTypes.ipdlh
+++ b/dom/cache/CacheTypes.ipdlh
@@ -81,16 +81,18 @@ struct CacheResponse
   nsCString[] urlList;
   uint32_t status;
   nsCString statusText;
   HeadersEntry[] headers;
   HeadersGuardEnum headersGuard;
   CacheReadStreamOrVoid body;
   IPCChannelInfo channelInfo;
   OptionalPrincipalInfo principalInfo;
+  uint32_t paddingInfo;
+  int64_t paddingSize;
 };
 
 union CacheResponseOrVoid
 {
   void_t;
   CacheResponse;
 };
 

--- a/dom/cache/DBAction.cpp
+++ b/dom/cache/DBAction.cpp
@@ -4,33 +4,62 @@
  * 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/. */
 
 #include "mozilla/dom/cache/DBAction.h"
 
 #include "mozilla/dom/cache/Connection.h"
 #include "mozilla/dom/cache/DBSchema.h"
 #include "mozilla/dom/cache/FileUtils.h"
+#include "mozilla/dom/cache/QuotaClient.h"
 #include "mozilla/dom/quota/PersistenceType.h"
 #include "mozilla/net/nsFileProtocolHandler.h"
 #include "mozIStorageConnection.h"
 #include "mozIStorageService.h"
 #include "mozStorageCID.h"
 #include "nsIFile.h"
 #include "nsIURI.h"
 #include "nsIFileURL.h"
 #include "nsThreadUtils.h"
 
 namespace mozilla {
 namespace dom {
 namespace cache {
 
+using mozilla::dom::quota::AssertIsOnIOThread;
 using mozilla::dom::quota::PERSISTENCE_TYPE_DEFAULT;
 using mozilla::dom::quota::PersistenceType;
 
+namespace {
+
+nsresult
+WipeDatabase(const QuotaInfo& aQuotaInfo, nsIFile* aDBFile,
+             nsIFile* aDBDir)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aDBFile);
+  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+
+  nsresult rv = RemoveNsIFile(aQuotaInfo, aDBFile);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  // Note, the -wal journal file will be automatically deleted by sqlite when
+  // the new database is created.  No need to explicitly delete it here.
+
+  // Delete the morgue as well.
+  rv = BodyDeleteDir(aQuotaInfo, aDBDir);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = WipePaddingFile(aQuotaInfo, aDBDir);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
+
+}
+
 DBAction::DBAction(Mode aMode)
   : mMode(aMode)
 {
 }
 
 DBAction::~DBAction()
 {
 }
@@ -95,35 +124,73 @@ DBAction::RunOnTarget(Resolver* aResolve
 nsresult
 DBAction::OpenConnection(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
                          mozIStorageConnection** aConnOut)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aDBDir);
   MOZ_DIAGNOSTIC_ASSERT(aConnOut);
 
-  nsCOMPtr<mozIStorageConnection> conn;
-
   bool exists;
   nsresult rv = aDBDir->Exists(&exists);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   if (!exists) {
     if (NS_WARN_IF(mMode != Create)) {  return NS_ERROR_FILE_NOT_FOUND; }
     rv = aDBDir->Create(nsIFile::DIRECTORY_TYPE, 0755);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
   }
 
+  rv = OpenDBConnection(aQuotaInfo, aDBDir, aConnOut);
+
+  return rv;
+}
+
+SyncDBAction::SyncDBAction(Mode aMode)
+  : DBAction(aMode)
+{
+}
+
+SyncDBAction::~SyncDBAction()
+{
+}
+
+void
+SyncDBAction::RunWithDBOnTarget(Resolver* aResolver,
+                                const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
+                                mozIStorageConnection* aConn)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aResolver);
+  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+
+  nsresult rv = RunSyncWithDBOnTarget(aQuotaInfo, aDBDir, aConn);
+  aResolver->Resolve(rv);
+}
+
+// static
+nsresult
+OpenDBConnection(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
+                 mozIStorageConnection** aConnOut)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConnOut);
+
+  nsCOMPtr<mozIStorageConnection> conn;
+
   nsCOMPtr<nsIFile> dbFile;
-  rv = aDBDir->Clone(getter_AddRefs(dbFile));
+  nsresult rv = aDBDir->Clone(getter_AddRefs(dbFile));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = dbFile->Append(NS_LITERAL_STRING("caches.sqlite"));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  bool exists = false;
   rv = dbFile->Exists(&exists);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   // Use our default file:// protocol handler directly to construct the database
   // URL.  This avoids any problems if a plugin registers a custom file://
   // handler.  If such a custom handler used javascript, then we would have a
   // bad time running off the main thread here.
   RefPtr<nsFileProtocolHandler> handler = new nsFileProtocolHandler();
@@ -182,54 +249,11 @@ DBAction::OpenConnection(const QuotaInfo
   rv = db::InitializeConnection(conn);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   conn.forget(aConnOut);
 
   return rv;
 }
 
-nsresult
-DBAction::WipeDatabase(const QuotaInfo& aQuotaInfo, nsIFile* aDBFile,
-                       nsIFile* aDBDir)
-{
-  MOZ_DIAGNOSTIC_ASSERT(aDBFile);
-  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
-
-  nsresult rv = RemoveNsIFile(aQuotaInfo, aDBFile);
-  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
-
-  // Note, the -wal journal file will be automatically deleted by sqlite when
-  // the new database is created.  No need to explicitly delete it here.
-
-  // Delete the morgue as well.
-  rv = BodyDeleteDir(aQuotaInfo, aDBDir);
-  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
-
-  return rv;
-}
-
-SyncDBAction::SyncDBAction(Mode aMode)
-  : DBAction(aMode)
-{
-}
-
-SyncDBAction::~SyncDBAction()
-{
-}
-
-void
-SyncDBAction::RunWithDBOnTarget(Resolver* aResolver,
-                                const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
-                                mozIStorageConnection* aConn)
-{
-  MOZ_ASSERT(!NS_IsMainThread());
-  MOZ_DIAGNOSTIC_ASSERT(aResolver);
-  MOZ_DIAGNOSTIC_ASSERT(aDBDir);
-  MOZ_DIAGNOSTIC_ASSERT(aConn);
-
-  nsresult rv = RunSyncWithDBOnTarget(aQuotaInfo, aDBDir, aConn);
-  aResolver->Resolve(rv);
-}
-
 } // namespace cache
 } // namespace dom
 } // namespace mozilla

--- a/dom/cache/DBAction.h
+++ b/dom/cache/DBAction.h
@@ -13,16 +13,20 @@
 
 class mozIStorageConnection;
 class nsIFile;
 
 namespace mozilla {
 namespace dom {
 namespace cache {
 
+nsresult
+OpenDBConnection(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
+                 mozIStorageConnection** aConnOut);
+
 class DBAction : public Action
 {
 protected:
   // The mode specifies whether the database should already exist or if its
   // ok to create a new database.
   enum Mode
   {
     Existing,
@@ -44,19 +48,16 @@ protected:
 private:
   virtual void
   RunOnTarget(Resolver* aResolver, const QuotaInfo& aQuotaInfo,
               Data* aOptionalData) override;
 
   nsresult OpenConnection(const QuotaInfo& aQuotaInfo, nsIFile* aQuotaDir,
                           mozIStorageConnection** aConnOut);
 
-  nsresult WipeDatabase(const QuotaInfo& aQuotaInfo, nsIFile* aDBFile,
-                        nsIFile* aDBDir);
-
   const Mode mMode;
 };
 
 class SyncDBAction : public DBAction
 {
 protected:
   explicit SyncDBAction(Mode aMode);
 

--- a/dom/cache/DBSchema.cpp
+++ b/dom/cache/DBSchema.cpp
@@ -5,16 +5,17 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/dom/cache/DBSchema.h"
 
 #include "ipc/IPCMessageUtils.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/dom/HeadersBinding.h"
 #include "mozilla/dom/InternalHeaders.h"
+#include "mozilla/dom/InternalResponse.h"
 #include "mozilla/dom/RequestBinding.h"
 #include "mozilla/dom/ResponseBinding.h"
 #include "mozilla/dom/cache/CacheTypes.h"
 #include "mozilla/dom/cache/SavedTypes.h"
 #include "mozilla/dom/cache/Types.h"
 #include "mozilla/dom/cache/TypeUtils.h"
 #include "mozIStorageConnection.h"
 #include "mozIStorageStatement.h"
@@ -30,17 +31,17 @@
 
 namespace mozilla {
 namespace dom {
 namespace cache {
 namespace db {
 const int32_t kFirstShippedSchemaVersion = 15;
 namespace {
 // Update this whenever the DB schema is changed.
-const int32_t kLatestSchemaVersion = 25;
+const int32_t kLatestSchemaVersion = 26;
 // ---------
 // The following constants define the SQL schema.  These are defined in the
 // same order the SQL should be executed in CreateOrMigrateSchema().  They are
 // broken out as constants for convenient use in validation and migration.
 // ---------
 // The caches table is the single source of truth about what Cache
 // objects exist for the origin.  The contents of the Cache are stored
 // in the entries table that references back to caches.
@@ -96,17 +97,18 @@ const char* const kTableEntries =
     "response_headers_guard INTEGER NOT NULL, "
     "response_body_id TEXT NULL, "
     "response_security_info_id INTEGER NULL REFERENCES security_info(id), "
     "response_principal_info TEXT NOT NULL, "
     "cache_id INTEGER NOT NULL REFERENCES caches(id) ON DELETE CASCADE, "
     "request_redirect INTEGER NOT NULL, "
     "request_referrer_policy INTEGER NOT NULL, "
     "request_integrity TEXT NOT NULL, "
-    "request_url_fragment TEXT NOT NULL"
+    "request_url_fragment TEXT NOT NULL, "
+    "response_padding_size INTEGER NULL "
     // New columns must be added at the end of table to migrate and
     // validate properly.
   ")";
 // Create an index to support the QueryCache() matching algorithm.  This
 // needs to quickly find entries in a given Cache that match the request
 // URL.  The url query is separated in order to support the ignoreSearch
 // option.  Finally, we index hashes of the URL values instead of the
 // actual strings to avoid excessive disk bloat.  The index will duplicate
@@ -314,16 +316,17 @@ static nsresult QueryCache(mozIStorageCo
                            uint32_t aMaxResults = UINT32_MAX);
 static nsresult MatchByVaryHeader(mozIStorageConnection* aConn,
                                   const CacheRequest& aRequest,
                                   EntryId entryId, bool* aSuccessOut);
 static nsresult DeleteEntries(mozIStorageConnection* aConn,
                               const nsTArray<EntryId>& aEntryIdList,
                               nsTArray<nsID>& aDeletedBodyIdListOut,
                               nsTArray<IdCount>& aDeletedSecurityIdListOut,
+                              int64_t* aDeletedPaddingSizeOut,
                               uint32_t aPos=0, int32_t aLen=-1);
 static nsresult InsertSecurityInfo(mozIStorageConnection* aConn,
                                    nsICryptoHash* aCrypto,
                                    const nsACString& aData, int32_t *aIdOut);
 static nsresult DeleteSecurityInfo(mozIStorageConnection* aConn, int32_t aId,
                                    int32_t aCount);
 static nsresult DeleteSecurityInfoList(mozIStorageConnection* aConn,
                                        const nsTArray<IdCount>& aDeletedStorageIdList);
@@ -593,33 +596,38 @@ CreateCacheId(mozIStorageConnection* aCo
   rv = state->GetInt64(0, aCacheIdOut);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   return rv;
 }
 
 nsresult
 DeleteCacheId(mozIStorageConnection* aConn, CacheId aCacheId,
-              nsTArray<nsID>& aDeletedBodyIdListOut)
+              nsTArray<nsID>& aDeletedBodyIdListOut,
+              int64_t* aDeletedPaddingSizeOut)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aDeletedPaddingSizeOut);
 
   // Delete the bodies explicitly as we need to read out the body IDs
   // anyway.  These body IDs must be deleted one-by-one as content may
   // still be referencing them invidivually.
   AutoTArray<EntryId, 256> matches;
   nsresult rv = QueryAll(aConn, aCacheId, matches);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   AutoTArray<IdCount, 16> deletedSecurityIdList;
+  int64_t deletedPaddingSize = 0;
   rv = DeleteEntries(aConn, matches, aDeletedBodyIdListOut,
-                     deletedSecurityIdList);
+                     deletedSecurityIdList, &deletedPaddingSize);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  *aDeletedPaddingSizeOut = deletedPaddingSize;
+
   rv = DeleteSecurityInfoList(aConn, deletedSecurityIdList);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   // Delete the remainder of the cache using cascade semantics.
   nsCOMPtr<mozIStorageStatement> state;
   rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
     "DELETE FROM caches WHERE id=:id;"
   ), getter_AddRefs(state));
@@ -686,16 +694,47 @@ FindOrphanedCacheIds(mozIStorageConnecti
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
     aOrphanedListOut.AppendElement(cacheId);
   }
 
   return rv;
 }
 
 nsresult
+FindOverallPaddingSize(mozIStorageConnection* aConn,
+                       int64_t* aOverallPaddingSizeOut)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aOverallPaddingSizeOut);
+
+  nsCOMPtr<mozIStorageStatement> state;
+  nsresult rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
+    "SELECT response_padding_size FROM entries "
+    "WHERE response_padding_size IS NOT NULL;"
+  ), getter_AddRefs(state));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  int64_t overallPaddingSize = 0;
+  bool hasMoreData = false;
+  while (NS_SUCCEEDED(state->ExecuteStep(&hasMoreData)) && hasMoreData) {
+    int64_t padding_size = 0;
+    rv = state->GetInt64(0, &padding_size);
+    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+    MOZ_DIAGNOSTIC_ASSERT(padding_size >= 0);
+    MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - padding_size >= overallPaddingSize);
+    overallPaddingSize += padding_size;
+  }
+
+  *aOverallPaddingSizeOut = overallPaddingSize;
+
+  return rv;
+}
+
+nsresult
 GetKnownBodyIds(mozIStorageConnection* aConn, nsTArray<nsID>& aBodyIdListOut)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aConn);
 
   nsCOMPtr<mozIStorageStatement> state;
   nsresult rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
     "SELECT request_body_id, response_body_id FROM entries;"
@@ -787,69 +826,79 @@ CacheMatchAll(mozIStorageConnection* aCo
 }
 
 nsresult
 CachePut(mozIStorageConnection* aConn, CacheId aCacheId,
          const CacheRequest& aRequest,
          const nsID* aRequestBodyId,
          const CacheResponse& aResponse,
          const nsID* aResponseBodyId,
-         nsTArray<nsID>& aDeletedBodyIdListOut)
+         nsTArray<nsID>& aDeletedBodyIdListOut,
+         int64_t* aDeletedPaddingSizeOut)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aDeletedPaddingSizeOut);
 
   CacheQueryParams params(false, false, false, false,
                            NS_LITERAL_STRING(""));
   AutoTArray<EntryId, 256> matches;
   nsresult rv = QueryCache(aConn, aCacheId, aRequest, params, matches);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   AutoTArray<IdCount, 16> deletedSecurityIdList;
+  int64_t deletedPaddingSize = 0;
   rv = DeleteEntries(aConn, matches, aDeletedBodyIdListOut,
-                     deletedSecurityIdList);
+                     deletedSecurityIdList, &deletedPaddingSize);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = InsertEntry(aConn, aCacheId, aRequest, aRequestBodyId, aResponse,
                    aResponseBodyId);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   // Delete the security values after doing the insert to avoid churning
   // the security table when its not necessary.
   rv = DeleteSecurityInfoList(aConn, deletedSecurityIdList);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  *aDeletedPaddingSizeOut = deletedPaddingSize;
+
   return rv;
 }
 
 nsresult
 CacheDelete(mozIStorageConnection* aConn, CacheId aCacheId,
             const CacheRequest& aRequest,
             const CacheQueryParams& aParams,
-            nsTArray<nsID>& aDeletedBodyIdListOut, bool* aSuccessOut)
+            nsTArray<nsID>& aDeletedBodyIdListOut,
+            int64_t* aDeletedPaddingSizeOut, bool* aSuccessOut)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aDeletedPaddingSizeOut);
   MOZ_DIAGNOSTIC_ASSERT(aSuccessOut);
 
   *aSuccessOut = false;
 
   AutoTArray<EntryId, 256> matches;
   nsresult rv = QueryCache(aConn, aCacheId, aRequest, aParams, matches);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   if (matches.IsEmpty()) {
     return rv;
   }
 
   AutoTArray<IdCount, 16> deletedSecurityIdList;
+  int64_t deletedPaddingSize = 0;
   rv = DeleteEntries(aConn, matches, aDeletedBodyIdListOut,
-                     deletedSecurityIdList);
+                     deletedSecurityIdList, &deletedPaddingSize);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  *aDeletedPaddingSizeOut = deletedPaddingSize;
+
   rv = DeleteSecurityInfoList(aConn, deletedSecurityIdList);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   *aSuccessOut = true;
 
   return rv;
 }
 
@@ -1328,63 +1377,78 @@ MatchByVaryHeader(mozIStorageConnection*
   return rv;
 }
 
 nsresult
 DeleteEntries(mozIStorageConnection* aConn,
               const nsTArray<EntryId>& aEntryIdList,
               nsTArray<nsID>& aDeletedBodyIdListOut,
               nsTArray<IdCount>& aDeletedSecurityIdListOut,
+              int64_t* aDeletedPaddingSizeOut,
               uint32_t aPos, int32_t aLen)
 {
   MOZ_ASSERT(!NS_IsMainThread());
   MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aDeletedPaddingSizeOut);
 
   if (aEntryIdList.IsEmpty()) {
     return NS_OK;
   }
 
   MOZ_DIAGNOSTIC_ASSERT(aPos < aEntryIdList.Length());
 
   if (aLen < 0) {
     aLen = aEntryIdList.Length() - aPos;
   }
 
   // Sqlite limits the number of entries allowed for an IN clause,
   // so split up larger operations.
   if (aLen > kMaxEntriesPerStatement) {
+    int64_t overallDeletedPaddingSize = 0;
     uint32_t curPos = aPos;
     int32_t remaining = aLen;
     while (remaining > 0) {
+      int64_t deletedPaddingSize = 0;
       int32_t max = kMaxEntriesPerStatement;
       int32_t curLen = std::min(max, remaining);
       nsresult rv = DeleteEntries(aConn, aEntryIdList, aDeletedBodyIdListOut,
-                                  aDeletedSecurityIdListOut, curPos, curLen);
+                                  aDeletedSecurityIdListOut,
+                                  &deletedPaddingSize, curPos, curLen);
       if (NS_FAILED(rv)) { return rv; }
 
+      MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - deletedPaddingSize >=
+                            overallDeletedPaddingSize);
+      overallDeletedPaddingSize += deletedPaddingSize;
       curPos += curLen;
       remaining -= curLen;
     }
+
+    *aDeletedPaddingSizeOut += overallDeletedPaddingSize;
     return NS_OK;
   }
 
   nsCOMPtr<mozIStorageStatement> state;
   nsAutoCString query(
-    "SELECT request_body_id, response_body_id, response_security_info_id "
+    "SELECT "
+      "request_body_id, "
+      "response_body_id, "
+      "response_security_info_id, "
+      "response_padding_size "
     "FROM entries WHERE id IN ("
   );
   AppendListParamsToQuery(query, aEntryIdList, aPos, aLen);
   query.AppendLiteral(")");
 
   nsresult rv = aConn->CreateStatement(query, getter_AddRefs(state));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = BindListParamsToQuery(state, aEntryIdList, aPos, aLen);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  int64_t overallPaddingSize = 0;
   bool hasMoreData = false;
   while (NS_SUCCEEDED(state->ExecuteStep(&hasMoreData)) && hasMoreData) {
     // extract 0 to 2 nsID structs per row
     for (uint32_t i = 0; i < 2; ++i) {
       bool isNull = false;
 
       rv = state->GetIsNull(i, &isNull);
       if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
@@ -1418,18 +1482,34 @@ DeleteEntries(mozIStorageConnection* aCo
         }
       }
 
       // Otherwise add a new entry for this ID with a count of 1
       if (!found) {
         aDeletedSecurityIdListOut.AppendElement(IdCount(securityId));
       }
     }
+
+    // It's possible to have null padding size for non-opaque response
+    rv = state->GetIsNull(3, &isNull);
+    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+    if (!isNull) {
+      int64_t paddingSize = 0;
+      rv = state->GetInt64(3, &paddingSize);
+      if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+      MOZ_DIAGNOSTIC_ASSERT(paddingSize >= 0);
+      MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - overallPaddingSize >= paddingSize);
+      overallPaddingSize += paddingSize;
+    }
   }
 
+  *aDeletedPaddingSizeOut = overallPaddingSize;
+
   // Dependent records removed via ON DELETE CASCADE
 
   query = NS_LITERAL_CSTRING(
     "DELETE FROM entries WHERE id IN ("
   );
   AppendListParamsToQuery(query, aEntryIdList, aPos, aLen);
   query.AppendLiteral(")");
 
@@ -1665,16 +1745,17 @@ InsertEntry(mozIStorageConnection* aConn
       "request_body_id, "
       "response_type, "
       "response_status, "
       "response_status_text, "
       "response_headers_guard, "
       "response_body_id, "
       "response_security_info_id, "
       "response_principal_info, "
+      "response_padding_size, "
       "cache_id "
     ") VALUES ("
       ":request_method, "
       ":request_url_no_query, "
       ":request_url_no_query_hash, "
       ":request_url_query, "
       ":request_url_query_hash, "
       ":request_url_fragment, "
@@ -1690,16 +1771,17 @@ InsertEntry(mozIStorageConnection* aConn
       ":request_body_id, "
       ":response_type, "
       ":response_status, "
       ":response_status_text, "
       ":response_headers_guard, "
       ":response_body_id, "
       ":response_security_info_id, "
       ":response_principal_info, "
+      ":response_padding_size, "
       ":cache_id "
     ");"
   ), getter_AddRefs(state));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = state->BindUTF8StringByName(NS_LITERAL_CSTRING("request_method"),
                                    aRequest.method());
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
@@ -1807,16 +1889,28 @@ InsertEntry(mozIStorageConnection* aConn
     cInfo.attrs().CreateSuffix(suffix);
     serializedInfo.Append(suffix);
   }
 
   rv = state->BindUTF8StringByName(NS_LITERAL_CSTRING("response_principal_info"),
                                    serializedInfo);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  if (aResponse.paddingSize() == InternalResponse::UNKNOWN_PADDING_SIZE) {
+    MOZ_DIAGNOSTIC_ASSERT(aResponse.type() != ResponseType::Opaque);
+    rv = state->BindNullByName(NS_LITERAL_CSTRING("response_padding_size"));
+  } else {
+    MOZ_DIAGNOSTIC_ASSERT(aResponse.paddingSize() >= 0);
+    MOZ_DIAGNOSTIC_ASSERT(aResponse.type() == ResponseType::Opaque);
+
+    rv = state->BindInt64ByName(NS_LITERAL_CSTRING("response_padding_size"),
+                                aResponse.paddingSize());
+  }
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
   rv = state->BindInt64ByName(NS_LITERAL_CSTRING("cache_id"), aCacheId);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = state->Execute();
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
     "SELECT last_insert_rowid()"
@@ -1892,17 +1986,17 @@ InsertEntry(mozIStorageConnection* aConn
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   const nsTArray<nsCString>& responseUrlList = aResponse.urlList();
   for (uint32_t i = 0; i < responseUrlList.Length(); ++i) {
     rv = state->BindUTF8StringByName(NS_LITERAL_CSTRING("url"),
                                      responseUrlList[i]);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
-    rv = state->BindInt64ByName(NS_LITERAL_CSTRING("entry_id"), entryId);
+    rv = state->BindInt32ByName(NS_LITERAL_CSTRING("entry_id"), entryId);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     rv = state->Execute();
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
   }
 
   return rv;
 }
@@ -1919,16 +2013,17 @@ ReadResponse(mozIStorageConnection* aCon
   nsresult rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
     "SELECT "
       "entries.response_type, "
       "entries.response_status, "
       "entries.response_status_text, "
       "entries.response_headers_guard, "
       "entries.response_body_id, "
       "entries.response_principal_info, "
+      "entries.response_padding_size, "
       "security_info.data "
     "FROM entries "
     "LEFT OUTER JOIN security_info "
     "ON entries.response_security_info_id=security_info.id "
     "WHERE entries.id=:id;"
   ), getter_AddRefs(state));
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
@@ -1980,17 +2075,37 @@ ReadResponse(mozIStorageConnection* aCon
       NS_WARNING("Something went wrong parsing a serialized principal!");
       return NS_ERROR_FAILURE;
     }
 
     aSavedResponseOut->mValue.principalInfo() =
       mozilla::ipc::ContentPrincipalInfo(attrs, void_t(), specNoSuffix);
   }
 
-  rv = state->GetBlobAsUTF8String(6, aSavedResponseOut->mValue.channelInfo().securityInfo());
+  bool nullPadding = false;
+  rv = state->GetIsNull(6, &nullPadding);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  if (nullPadding) {
+    MOZ_DIAGNOSTIC_ASSERT(aSavedResponseOut->mValue.type() !=
+                          ResponseType::Opaque);
+    aSavedResponseOut->mValue.paddingSize() =
+      InternalResponse::UNKNOWN_PADDING_SIZE;
+  } else {
+    MOZ_DIAGNOSTIC_ASSERT(aSavedResponseOut->mValue.type() ==
+                          ResponseType::Opaque);
+    int64_t paddingSize = 0;
+    rv = state->GetInt64(6, &paddingSize);
+    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+    MOZ_DIAGNOSTIC_ASSERT(paddingSize >= 0);
+    aSavedResponseOut->mValue.paddingSize() = paddingSize;
+  }
+
+  rv = state->GetBlobAsUTF8String(7, aSavedResponseOut->mValue.channelInfo().securityInfo());
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = aConn->CreateStatement(NS_LITERAL_CSTRING(
     "SELECT "
       "name, "
       "value "
     "FROM response_headers "
     "WHERE entry_id=:entry_id;"
@@ -2477,28 +2592,30 @@ nsresult MigrateFrom16To17(mozIStorageCo
 nsresult MigrateFrom17To18(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom18To19(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom19To20(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom20To21(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom21To22(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom22To23(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom23To24(mozIStorageConnection* aConn, bool& aRewriteSchema);
 nsresult MigrateFrom24To25(mozIStorageConnection* aConn, bool& aRewriteSchema);
+nsresult MigrateFrom25To26(mozIStorageConnection* aConn, bool& aRewriteSchema);
 // Configure migration functions to run for the given starting version.
 Migration sMigrationList[] = {
   Migration(15, MigrateFrom15To16),
   Migration(16, MigrateFrom16To17),
   Migration(17, MigrateFrom17To18),
   Migration(18, MigrateFrom18To19),
   Migration(19, MigrateFrom19To20),
   Migration(20, MigrateFrom20To21),
   Migration(21, MigrateFrom21To22),
   Migration(22, MigrateFrom22To23),
   Migration(23, MigrateFrom23To24),
   Migration(24, MigrateFrom24To25),
+  Migration(25, MigrateFrom25To26),
 };
 uint32_t sMigrationListLength = sizeof(sMigrationList) / sizeof(Migration);
 nsresult
 RewriteEntriesSchema(mozIStorageConnection* aConn)
 {
   nsresult rv = aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
     "PRAGMA writable_schema = ON"
   ));
@@ -3025,13 +3142,40 @@ nsresult MigrateFrom24To25(mozIStorageCo
   MOZ_DIAGNOSTIC_ASSERT(aConn);
 
   // The only change between 24 and 25 was a new nsIContentPolicy type.
   nsresult rv = aConn->SetSchemaVersion(25);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
   return rv;
 }
 
+nsresult MigrateFrom25To26(mozIStorageConnection* aConn, bool& aRewriteSchema)
+{
+  MOZ_ASSERT(!NS_IsMainThread());
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+
+  // Add the response_padding_size column.
+  // Note: only opaque repsonse should be non-null interger.
+  nsresult rv = aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+    "ALTER TABLE entries "
+    "ADD COLUMN response_padding_size INTEGER NULL "
+  ));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  aConn->ExecuteSimpleSQL(NS_LITERAL_CSTRING(
+    "UPDATE entries SET response_padding_size = 0"
+    "WHERE response_type = 4" // opaque response
+  ));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = aConn->SetSchemaVersion(26);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  aRewriteSchema = true;
+
+  return rv;
+}
+
 } // anonymous namespace
 } // namespace db
 } // namespace cache
 } // namespace dom
 } // namespace mozilla

--- a/dom/cache/DBSchema.h
+++ b/dom/cache/DBSchema.h
@@ -37,28 +37,33 @@ CreateOrMigrateSchema(mozIStorageConnect
 nsresult
 InitializeConnection(mozIStorageConnection* aConn);
 
 nsresult
 CreateCacheId(mozIStorageConnection* aConn, CacheId* aCacheIdOut);
 
 nsresult
 DeleteCacheId(mozIStorageConnection* aConn, CacheId aCacheId,
-              nsTArray<nsID>& aDeletedBodyIdListOut);
+              nsTArray<nsID>& aDeletedBodyIdListOut,
+              int64_t* aDeletedPaddingSizeOut);
 
 // TODO: Consider removing unused IsCacheOrphaned after writing cleanup code. (bug 1110446)
 nsresult
 IsCacheOrphaned(mozIStorageConnection* aConn, CacheId aCacheId,
                 bool* aOrphanedOut);
 
 nsresult
 FindOrphanedCacheIds(mozIStorageConnection* aConn,
                      nsTArray<CacheId>& aOrphanedListOut);
 
 nsresult
+FindOverallPaddingSize(mozIStorageConnection* aConn,
+                       int64_t* aOverallPaddingSizeOut);
+
+nsresult
 GetKnownBodyIds(mozIStorageConnection* aConn, nsTArray<nsID>& aBodyIdListOut);
 
 nsresult
 CacheMatch(mozIStorageConnection* aConn, CacheId aCacheId,
            const CacheRequest& aRequest, const CacheQueryParams& aParams,
            bool* aFoundResponseOut, SavedResponse* aSavedResponseOut);
 
 nsresult
@@ -68,23 +73,25 @@ CacheMatchAll(mozIStorageConnection* aCo
               nsTArray<SavedResponse>& aSavedResponsesOut);
 
 nsresult
 CachePut(mozIStorageConnection* aConn, CacheId aCacheId,
          const CacheRequest& aRequest,
          const nsID* aRequestBodyId,
          const CacheResponse& aResponse,
          const nsID* aResponseBodyId,
-         nsTArray<nsID>& aDeletedBodyIdListOut);
+         nsTArray<nsID>& aDeletedBodyIdListOut,
+         int64_t* aDeletedPaddingSizeOut);
 
 nsresult
 CacheDelete(mozIStorageConnection* aConn, CacheId aCacheId,
             const CacheRequest& aRequest,
             const CacheQueryParams& aParams,
             nsTArray<nsID>& aDeletedBodyIdListOut,
+            int64_t* aDeletedPaddingSizeOut,
             bool* aSuccessOut);
 
 nsresult
 CacheKeys(mozIStorageConnection* aConn, CacheId aCacheId,
           const CacheRequestOrVoid& aRequestOrVoid,
           const CacheQueryParams& aParams,
           nsTArray<SavedRequest>& aSavedRequestsOut);
 

--- a/dom/cache/FileUtils.cpp
+++ b/dom/cache/FileUtils.cpp
@@ -1,49 +1,77 @@
 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
 /* 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/. */
 
 #include "mozilla/dom/cache/FileUtils.h"
 
+#include "mozilla/dom/InternalResponse.h"
 #include "mozilla/dom/quota/FileStreams.h"
 #include "mozilla/dom/quota/QuotaManager.h"
 #include "mozilla/SnappyCompressOutputStream.h"
 #include "mozilla/Unused.h"
+#include "nsIBinaryInputStream.h"
+#include "nsIBinaryOutputStream.h"
 #include "nsIFile.h"
 #include "nsIUUIDGenerator.h"
 #include "nsNetCID.h"
+#include "nsNetUtil.h"
 #include "nsISimpleEnumerator.h"
 #include "nsServiceManagerUtils.h"
 #include "nsString.h"
 #include "nsThreadUtils.h"
 
 namespace mozilla {
 namespace dom {
 namespace cache {
 
+#define PADDING_FILE_NAME ".padding"
+#define PADDING_TMP_FILE_NAME ".padding-tmp"
+
 using mozilla::dom::quota::FileInputStream;
 using mozilla::dom::quota::FileOutputStream;
 using mozilla::dom::quota::PERSISTENCE_TYPE_DEFAULT;
 using mozilla::dom::quota::QuotaManager;
+using mozilla::dom::quota::QuotaObject;
 
 namespace {
 
+// Const variable for generate padding size.
+// XXX This will be tweaked to something more meaningful in Bug 1383656.
+const int64_t kRoundUpNumber = 20480;
+
 enum BodyFileType
 {
   BODY_FILE_FINAL,
   BODY_FILE_TMP
 };
 
 nsresult
 BodyIdToFile(nsIFile* aBaseDir, const nsID& aId, BodyFileType aType,
              nsIFile** aBodyFileOut);
 
+int64_t
+RoundUp(const int64_t aX, const int64_t aY);
+
+// The alogrithm for generating padding refers to the mitigation approach in
+// https://github.com/whatwg/storage/issues/31.
+// First, generate a random number between 0 and 100kB.
+// Next, round up the sum of random number and response size to the nearest
+// 20kB.
+// Finally, the virtual padding size will be the result minus the response size.
+int64_t
+BodyGeneratePadding(const int64_t aBodyFileSize, const uint32_t aPaddingInfo);
+
+nsresult
+LockedDirectoryPaddingWrite(nsIFile* aBaseDir, DirPaddingFile aPaddingFileType,
+                            int64_t aPaddingSize);
+
 } // namespace
 
 // static
 nsresult
 BodyCreateDir(nsIFile* aBaseDir)
 {
   MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
 
@@ -243,16 +271,55 @@ BodyOpen(const QuotaInfo& aQuotaInfo, ns
 
   fileStream.forget(aStreamOut);
 
   return rv;
 }
 
 // static
 nsresult
+BodyMaybeUpdatePaddingSize(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
+                           const nsID& aId, const uint32_t aPaddingInfo,
+                           int64_t* aPaddingSizeOut)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aPaddingSizeOut);
+
+  nsCOMPtr<nsIFile> bodyFile;
+  nsresult rv =
+    BodyIdToFile(aBaseDir, aId, BODY_FILE_TMP, getter_AddRefs(bodyFile));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  MOZ_DIAGNOSTIC_ASSERT(bodyFile);
+
+  QuotaManager* quotaManager = QuotaManager::Get();
+  MOZ_DIAGNOSTIC_ASSERT(quotaManager);
+
+  int64_t fileSize = 0;
+  RefPtr<QuotaObject> quotaObject =
+    quotaManager->GetQuotaObject(PERSISTENCE_TYPE_DEFAULT, aQuotaInfo.mGroup,
+                                 aQuotaInfo.mOrigin, bodyFile, &fileSize);
+  MOZ_DIAGNOSTIC_ASSERT(quotaObject);
+  MOZ_DIAGNOSTIC_ASSERT(fileSize >= 0);
+
+  if (*aPaddingSizeOut == InternalResponse::UNKNOWN_PADDING_SIZE) {
+    *aPaddingSizeOut = BodyGeneratePadding(fileSize, aPaddingInfo);
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(*aPaddingSizeOut >= 0);
+
+  if (!quotaObject->IncreaseSize(*aPaddingSizeOut)) {
+    return NS_ERROR_FILE_NO_DEVICE_SPACE;
+  }
+
+  return rv;
+}
+
+// static
+nsresult
 BodyDeleteFiles(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
                 const nsTArray<nsID>& aIdList)
 {
   nsresult rv = NS_OK;
 
   for (uint32_t i = 0; i < aIdList.Length(); ++i) {
     nsCOMPtr<nsIFile> tmpFile;
     rv = BodyIdToFile(aBaseDir, aIdList[i], BODY_FILE_TMP,
@@ -305,16 +372,72 @@ BodyIdToFile(nsIFile* aBaseDir, const ns
   }
 
   rv = (*aBodyFileOut)->Append(fileName);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   return rv;
 }
 
+int64_t
+RoundUp(const int64_t aX, const int64_t aY)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aX >= 0);
+  MOZ_DIAGNOSTIC_ASSERT(aY > 0);
+
+  MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - ((aX - 1) / aY) * aY >= aY);
+  return aY + ((aX - 1) / aY) * aY;
+}
+
+int64_t
+BodyGeneratePadding(const int64_t aBodyFileSize, const uint32_t aPaddingInfo)
+{
+  // Generate padding
+  int64_t randomSize = static_cast<int64_t>(aPaddingInfo);
+  MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - aBodyFileSize >= randomSize);
+  randomSize += aBodyFileSize;
+
+  return RoundUp(randomSize, kRoundUpNumber) - aBodyFileSize;
+}
+
+nsresult
+LockedDirectoryPaddingWrite(nsIFile* aBaseDir, DirPaddingFile aPaddingFileType,
+                            int64_t aPaddingSize)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aPaddingSize >= 0);
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBaseDir->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  if (aPaddingFileType == DirPaddingFile::TMP_FILE) {
+    rv = file->Append(NS_LITERAL_STRING(PADDING_TMP_FILE_NAME));
+  } else {
+    rv = file->Append(NS_LITERAL_STRING(PADDING_FILE_NAME));
+  }
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  nsCOMPtr<nsIOutputStream> outputStream;
+  rv = NS_NewLocalFileOutputStream(getter_AddRefs(outputStream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  nsCOMPtr<nsIBinaryOutputStream> binaryStream =
+    do_CreateInstance("@mozilla.org/binaryoutputstream;1");
+  if (NS_WARN_IF(!binaryStream)) { return NS_ERROR_FAILURE; }
+
+  rv = binaryStream->SetOutputStream(outputStream);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = binaryStream->Write64(aPaddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
+
 } // namespace
 
 nsresult
 BodyDeleteOrphanedFiles(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
                         nsTArray<nsID>& aKnownBodyIdList)
 {
   MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
 
@@ -543,21 +666,257 @@ RemoveNsIFile(const QuotaInfo& aQuotaInf
       rv == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST) {
     return NS_OK;
   }
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
   rv = aFile->Remove( /* recursive */ false);
   if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+  if (fileSize > 0) {
+    DecreaseUsageForQuotaInfo(aQuotaInfo, fileSize);
+  }
+
+  return rv;
+}
+
+// static
+void
+DecreaseUsageForQuotaInfo(const QuotaInfo& aQuotaInfo,
+                          const int64_t& aUpdatingSize)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aUpdatingSize > 0);
+
   QuotaManager* quotaManager = QuotaManager::Get();
   MOZ_DIAGNOSTIC_ASSERT(quotaManager);
 
   quotaManager->DecreaseUsageForOrigin(PERSISTENCE_TYPE_DEFAULT,
                                        aQuotaInfo.mGroup, aQuotaInfo.mOrigin,
-                                       fileSize);
+                                       aUpdatingSize);
+}
+
+// static
+bool
+DirectoryPaddingFileExists(nsIFile* aBaseDir, DirPaddingFile aPaddingFileType)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBaseDir->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return false; }
+
+  nsString fileName;
+  if (aPaddingFileType == DirPaddingFile::TMP_FILE) {
+    fileName = NS_LITERAL_STRING(PADDING_TMP_FILE_NAME);
+  } else {
+    fileName = NS_LITERAL_STRING(PADDING_FILE_NAME);
+  }
+
+  rv = file->Append(fileName);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return false; }
+
+  bool exists = false;
+  rv = file->Exists(&exists);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return false; }
+
+  return exists;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingGet(nsIFile* aBaseDir, int64_t* aPaddingSizeOut)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aPaddingSizeOut);
+  MOZ_DIAGNOSTIC_ASSERT(!DirectoryPaddingFileExists(aBaseDir,
+                                                    DirPaddingFile::TMP_FILE));
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBaseDir->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = file->Append(NS_LITERAL_STRING(PADDING_FILE_NAME));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  nsCOMPtr<nsIInputStream> stream;
+  rv = NS_NewLocalFileInputStream(getter_AddRefs(stream), file);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  nsCOMPtr<nsIInputStream> bufferedStream;
+  rv = NS_NewBufferedInputStream(getter_AddRefs(bufferedStream), stream, 512);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  nsCOMPtr<nsIBinaryInputStream> binaryStream =
+    do_CreateInstance("@mozilla.org/binaryinputstream;1");
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = binaryStream->SetInputStream(bufferedStream);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  uint64_t paddingSize = 0;
+  rv = binaryStream->Read64(&paddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  *aPaddingSizeOut = paddingSize;
+
+  return rv;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingInit(nsIFile* aBaseDir)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+
+  nsresult rv = LockedDirectoryPaddingWrite(aBaseDir, DirPaddingFile::FILE, 0);
+  Unused << NS_WARN_IF(NS_FAILED(rv));
 
   return rv;
 }
 
+// static
+nsresult
+LockedUpdateDirectoryPaddingFile(nsIFile* aBaseDir,
+                                 mozIStorageConnection* aConn,
+                                 const int64_t aIncreaseSize,
+                                 const int64_t aDecreaseSize,
+                                 const bool aTemporaryFileExist)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+  MOZ_DIAGNOSTIC_ASSERT(aIncreaseSize >= 0);
+  MOZ_DIAGNOSTIC_ASSERT(aDecreaseSize >= 0);
+
+  int64_t currentPaddingSize = 0;
+  nsresult rv = LockedDirectoryPaddingGet(aBaseDir, &currentPaddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv)) || aTemporaryFileExist) {
+    // Fail to read padding size from the dir padding file, so try to restore.
+    if (rv != NS_ERROR_FILE_NOT_FOUND &&
+        rv != NS_ERROR_FILE_TARGET_DOES_NOT_EXIST) {
+      // Not delete the temporary padding file here, because we're going to
+      // overwrite it below anyway.
+      rv = LockedDirectoryPaddingDeleteFile(aBaseDir, DirPaddingFile::FILE);
+      if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+    }
+
+    // We don't need to add the aIncreaseSize or aDecreaseSize here, because
+    // it's already encompassed within the database.
+    rv = db::FindOverallPaddingSize(aConn, &currentPaddingSize);
+    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+  } else {
+    if (aIncreaseSize > 0) {
+      MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - currentPaddingSize >= aIncreaseSize);
+      currentPaddingSize += aIncreaseSize;
+    }
+
+    if (aDecreaseSize > 0) {
+      MOZ_DIAGNOSTIC_ASSERT(currentPaddingSize >= aDecreaseSize);
+      currentPaddingSize -= aDecreaseSize;
+    }
+
+#ifdef DEBUG
+    int64_t paddingSizeFromDB = 0;
+    rv = db::FindOverallPaddingSize(aConn, &paddingSizeFromDB);
+    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+    MOZ_DIAGNOSTIC_ASSERT(paddingSizeFromDB == currentPaddingSize);
+#endif // DEBUG
+  }
+
+  MOZ_DIAGNOSTIC_ASSERT(currentPaddingSize >= 0);
+
+  rv = LockedDirectoryPaddingTemporaryWrite(aBaseDir, currentPaddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingTemporaryWrite(nsIFile* aBaseDir, int64_t aPaddingSize)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aPaddingSize >= 0);
+
+  nsresult rv = LockedDirectoryPaddingWrite(aBaseDir, DirPaddingFile::TMP_FILE,
+                                            aPaddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingFinalizeWrite(nsIFile* aBaseDir)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(DirectoryPaddingFileExists(aBaseDir,
+                                                   DirPaddingFile::TMP_FILE));
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBaseDir->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = file->Append(NS_LITERAL_STRING(PADDING_TMP_FILE_NAME));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = file->RenameTo(nullptr, NS_LITERAL_STRING(PADDING_FILE_NAME));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingRestore(nsIFile* aBaseDir, mozIStorageConnection* aConn)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+  MOZ_DIAGNOSTIC_ASSERT(aConn);
+
+  // The content of padding file is untrusted, so remove it here.
+  nsresult rv = LockedDirectoryPaddingDeleteFile(aBaseDir,
+                                                 DirPaddingFile::TMP_FILE);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = LockedDirectoryPaddingDeleteFile(aBaseDir, DirPaddingFile::FILE);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  int64_t paddingSize = 0;
+  rv = db::FindOverallPaddingSize(aConn, &paddingSize);
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  MOZ_DIAGNOSTIC_ASSERT(paddingSize >= 0);
+
+  LockedDirectoryPaddingWrite(aBaseDir, DirPaddingFile::FILE, paddingSize);
+
+  return rv;
+}
+
+// static
+nsresult
+LockedDirectoryPaddingDeleteFile(nsIFile* aBaseDir,
+                                 DirPaddingFile aPaddingFileType)
+{
+  MOZ_DIAGNOSTIC_ASSERT(aBaseDir);
+
+  nsCOMPtr<nsIFile> file;
+  nsresult rv = aBaseDir->Clone(getter_AddRefs(file));
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  if (aPaddingFileType == DirPaddingFile::TMP_FILE) {
+    rv = file->Append(NS_LITERAL_STRING(PADDING_TMP_FILE_NAME));
+  } else {
+    rv = file->Append(NS_LITERAL_STRING(PADDING_FILE_NAME));
+  }
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  rv = file->Remove( /* recursive */ false);
+  if (rv == NS_ERROR_FILE_NOT_FOUND ||
+      rv == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST) {
+    return NS_OK;
+  }
+  if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+  return rv;
+}
 } // namespace cache
 } // namespace dom
 } // namespace mozilla

--- a/dom/cache/FileUtils.h
+++ b/dom/cache/FileUtils.h
@@ -14,16 +14,22 @@
 
 struct nsID;
 class nsIFile;
 
 namespace mozilla {
 namespace dom {
 namespace cache {
 
+enum DirPaddingFile
+{
+  FILE,
+  TMP_FILE
+};
+
 nsresult
 BodyCreateDir(nsIFile* aBaseDir);
 
 // Note that this function can only be used during the initialization of the
 // database.  We're unlikely to be able to delete the DB successfully past
 // that point due to the file being in use.
 nsresult
 BodyDeleteDir(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir);
@@ -43,16 +49,20 @@ BodyCancelWrite(nsIFile* aBaseDir, nsISu
 nsresult
 BodyFinalizeWrite(nsIFile* aBaseDir, const nsID& aId);
 
 nsresult
 BodyOpen(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir, const nsID& aId,
          nsIInputStream** aStreamOut);
 
 nsresult
+BodyMaybeUpdatePaddingSize(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
+                           const nsID& aId, int64_t* aPaddingSizeOut);
+
+nsresult
 BodyDeleteFiles(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
                 const nsTArray<nsID>& aIdList);
 
 nsresult
 BodyDeleteOrphanedFiles(const QuotaInfo& aQuotaInfo, nsIFile* aBaseDir,
                         nsTArray<nsID>& aKnownBodyIdList);
 
 nsresult
@@ -65,13 +75,59 @@ bool
 MarkerFileExists(const QuotaInfo& aQuotaInfo);
 
 nsresult
 RemoveNsIFileRecursively(const QuotaInfo& aQuotaInfo, nsIFile* aFile);
 
 nsresult
 RemoveNsIFile(const QuotaInfo& aQuotaInfo, nsIFile* aFile);
 
+void
+DecreaseUsageForQuotaInfo(const QuotaInfo& aQuotaInfo,
+                          const int64_t& aUpdatingSize);
+
+/**
+ * This function is used to check if the directory padding file is existed.
+ */
+
+bool
+DirectoryPaddingFileExists(nsIFile* aBaseDir, DirPaddingFile aPaddingFileType);
+
+/**
+ *
+ * The functions below are used to read/write/delete the directory padding file
+ * after acquiring the mutex lock. The mutex lock is held by
+ * CacheQuotaClient to prevent multi-thread accessing issue. To avoid deadlock,
+ * these functions should only access by static functions in
+ * dom/cache/QuotaClient.cpp.
+ *
+ */
+
+nsresult
+LockedDirectoryPaddingGet(nsIFile* aBaseDir, int64_t* aPaddingSizeOut);
+
+nsresult
+LockedDirectoryPaddingInit(nsIFile* aBaseDir);
+
+nsresult
+LockedUpdateDirectoryPaddingFile(nsIFile* aBaseDir,
+                                 mozIStorageConnection* aConn,
+                                 const int64_t aIncreaseSize,
+                                 const int64_t aDecreaseSize,
+                                 const bool aTemporaryFileExist);
+
+nsresult
+LockedDirectoryPaddingTemporaryWrite(nsIFile* aBaseDir, int64_t aPaddingSize);
+
+nsresult
+LockedDirectoryPaddingFinalizeWrite(nsIFile* aBaseDir);
+
+nsresult
+LockedDirectoryPaddingRestore(nsIFile* aBaseDir, mozIStorageConnection* aConn);
+
+nsresult
+LockedDirectoryPaddingDeleteFile(nsIFile* aBaseDir,
+                                 DirPaddingFile aPaddingFileType);
 } // namespace cache
 } // namespace dom
 } // namespace mozilla
 
 #endif // mozilla_dom_cache_FileUtils_h

--- a/dom/cache/Manager.cpp
+++ b/dom/cache/Manager.cpp
@@ -15,16 +15,17 @@
 #include "mozilla/dom/cache/DBAction.h"
 #include "mozilla/dom/cache/DBSchema.h"
 #include "mozilla/dom/cache/FileUtils.h"
 #include "mozilla/dom/cache/ManagerId.h"
 #include "mozilla/dom/cache/CacheTypes.h"
 #include "mozilla/dom/cache/SavedTypes.h"
 #include "mozilla/dom/cache/StreamList.h"
 #include "mozilla/dom/cache/Types.h"
+#include "mozilla/dom/cache/QuotaClient.h"
 #include "mozilla/ipc/BackgroundParent.h"
 #include "mozStorageHelper.h"
 #include "nsIInputStream.h"
 #include "nsID.h"
 #include "nsIFile.h"
 #include "nsIThread.h"
 #include "nsThreadUtils.h"
 #include "nsTObserverArray.h"
@@ -45,16 +46,18 @@ public:
   SetupAction()
     : SyncDBAction(DBAction::Create)
   { }
 
   virtual nsresult
   RunSyncWithDBOnTarget(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
                         mozIStorageConnection* aConn) override
   {
+    MOZ_DIAGNOSTIC_ASSERT(aDBDir);
+
     nsresult rv = BodyCreateDir(aDBDir);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     // executes in its own transaction
     rv = db::CreateOrMigrateSchema(aConn);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     // If the Context marker file exists, then the last session was
@@ -72,31 +75,56 @@ public:
       mozStorageTransaction trans(aConn, false,
                                   mozIStorageConnection::TRANSACTION_IMMEDIATE);
 
       // Clean up orphaned Cache objects
       AutoTArray<CacheId, 8> orphanedCacheIdList;
       nsresult rv = db::FindOrphanedCacheIds(aConn, orphanedCacheIdList);
       if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
+      int64_t overallDeletedPaddingSize = 0;
       for (uint32_t i = 0; i < orphanedCacheIdList.Length(); ++i) {
         AutoTArray<nsID, 16> deletedBodyIdList;
-        rv = db::DeleteCacheId(aConn, orphanedCacheIdList[i], deletedBodyIdList);
+        int64_t deletedPaddingSize = 0;
+        rv = db::DeleteCacheId(aConn, orphanedCacheIdList[i], deletedBodyIdList,
+                               &deletedPaddingSize);
         if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
         rv = BodyDeleteFiles(aQuotaInfo, aDBDir, deletedBodyIdList);
         if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+        if (deletedPaddingSize > 0) {
+          DecreaseUsageForQuotaInfo(aQuotaInfo, deletedPaddingSize);
+        }
+
+        MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - deletedPaddingSize >=
+                              overallDeletedPaddingSize);
+        overallDeletedPaddingSize += deletedPaddingSize;
       }
 
       // Clean up orphaned body objects
       AutoTArray<nsID, 64> knownBodyIdList;
       rv = db::GetKnownBodyIds(aConn, knownBodyIdList);
 
       rv = BodyDeleteOrphanedFiles(aQuotaInfo, aDBDir, knownBodyIdList);
       if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+
+      // Commit() explicitly here, because we want to ensure the padding file
+      // has the correct content.
+      rv = MaybeUpdatePaddingFile(aDBDir, aConn, /* aIncreaceSize */ 0,
+                                  overallDeletedPaddingSize,
+                                  [&trans]() mutable { return trans.Commit(); });
+      // We'll restore padding file below, so just warn here if failure happens.
+      Unused << NS_WARN_IF(NS_FAILED(rv));
+    }
+
+    if (DirectoryPaddingFileExists(aDBDir, DirPaddingFile::TMP_FILE) ||
+        !DirectoryPaddingFileExists(aDBDir, DirPaddingFile::FILE)) {
+      rv = RestorePaddingFile(aDBDir, aConn);
+      if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
     }
 
     return rv;
   }
 };
 
 // ----------------------------------------------------------------------------
 
@@ -435,47 +463,60 @@ protected:
 // a Cache object that has been orphaned.
 class Manager::DeleteOrphanedCacheAction final : public SyncDBAction
 {
 public:
   DeleteOrphanedCacheAction(Manager* aManager, CacheId aCacheId)
     : SyncDBAction(DBAction::Existing)
     , mManager(aManager)
     , mCacheId(aCacheId)
+    , mDeletedPaddingSize(0)
   { }
 
   virtual nsresult
   RunSyncWithDBOnTarget(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
                         mozIStorageConnection* aConn) override
   {
+    mQuotaInfo.emplace(aQuotaInfo);
+
     mozStorageTransaction trans(aConn, false,
                                 mozIStorageConnection::TRANSACTION_IMMEDIATE);
 
-    nsresult rv = db::DeleteCacheId(aConn, mCacheId, mDeletedBodyIdList);
+    nsresult rv = db::DeleteCacheId(aConn, mCacheId, mDeletedBodyIdList,
+                                    &mDeletedPaddingSize);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
-    rv = trans.Commit();
-    if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
+    rv = MaybeUpdatePaddingFile(aDBDir, aConn, /* aIncreaceSize */ 0,
+                                mDeletedPaddingSize,
+                                [&trans]() mutable { return trans.Commit(); });
+    Unused << NS_WARN_IF(NS_FAILED(rv));
 
     return rv;
   }
 
   virtual void
   CompleteOnInitiatingThread(nsresult aRv) override
   {
     mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
 
+    if (mDeletedPaddingSize > 0) {
+      DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
+    }
+
     // ensure we release the manager on the initiating thread
     mManager = nullptr;
   }
 
 private:
   RefPtr<Manager> mManager;
   const CacheId mCacheId;
   nsTArray<nsID> mDeletedBodyIdList;
+  Maybe<QuotaInfo> mQuotaInfo;
+  // Track any pad amount associated with orphaned entries.
+  int64_t mDeletedPaddingSize;
 };
 
 // ----------------------------------------------------------------------------
 
 class Manager::CacheMatchAction final : public Manager::BaseAction
 {
 public:
   CacheMatchAction(Manager* aManager, ListenerId aListenerId,
@@ -616,16 +657,18 @@ public:
     : DBAction(DBAction::Existing)
     , mManager(aManager)
     , mListenerId(aListenerId)
     , mCacheId(aCacheId)
     , mList(aPutList.Length())
     , mExpectedAsyncCopyCompletions(1)
     , mAsyncResult(NS_OK)
     , mMutex("cache::Manager::CachePutAllAction")
+    , mUpdatedPaddingSize(0)
+    , mDeletedPaddingSize(0)
   {
     MOZ_DIAGNOSTIC_ASSERT(!aPutList.IsEmpty());
     MOZ_DIAGNOSTIC_ASSERT(aPutList.Length() == aRequestStreamList.Length());
     MOZ_DIAGNOSTIC_ASSERT(aPutList.Length() == aResponseStreamList.Length());
 
     for (uint32_t i = 0; i < aPutList.Length(); ++i) {
       Entry* entry = mList.AppendElement();
       entry->mRequest = aPutList[i].request();
@@ -676,17 +719,16 @@ private:
 
       rv = StartStreamCopy(aQuotaInfo, mList[i], ResponseStream,
                            &mExpectedAsyncCopyCompletions);
       if (NS_WARN_IF(NS_FAILED(rv))) {
         break;
       }
     }
 
-
     // Always call OnAsyncCopyComplete() manually here.  This covers the
     // case where there is no async copying and also reports any startup
     // errors correctly.  If we hit an error, then OnAsyncCopyComplete()
     // will cancel any async copying.
     OnAsyncCopyComplete(rv);
   }
 
   // Called once for each asynchronous file copy whether it succeeds or
@@ -757,35 +799,60 @@ private:
       if (e.mRequestStream) {
         rv = BodyFinalizeWrite(mDBDir, e.mRequestBodyId);
         if (NS_WARN_IF(NS_FAILED(rv))) {
           DoResolve(rv);
           return;
         }
       }
       if (e.mResponseStream) {
+        // Gerenate padding size for opaque response if needed.
+        if (e.mResponse.type() == ResponseType::Opaque) {
+          // It'll generate padding if we've not set it yet.
+          rv = BodyMaybeUpdatePaddingSize(mQuotaInfo.ref(), mDBDir,
+                                          e.mResponseBodyId,
+                                          e.mResponse.paddingInfo(),
+                                          &e.mResponse.paddingSize());
+          if (NS_WARN_IF(NS_FAILED(rv))) {
+            DoResolve(rv);
+            return;
+          }
+
+          MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - e.mResponse.paddingSize() >=
+                                mUpdatedPaddingSize);
+          mUpdatedPaddingSize += e.mResponse.paddingSize();
+        }
+
         rv = BodyFinalizeWrite(mDBDir, e.mResponseBodyId);
         if (NS_WARN_IF(NS_FAILED(rv))) {
           DoResolve(rv);
           return;
         }
       }
 
+      int64_t deletedPaddingSize = 0;
       rv = db::CachePut(mConn, mCacheId, e.mRequest,
                         e.mRequestStream ? &e.mRequestBodyId : nullptr,
                         e.mResponse,
                         e.mResponseStream ? &e.mResponseBodyId : nullptr,
-                        mDeletedBodyIdList);
+                        mDeletedBodyIdList, &deletedPaddingSize);
       if (NS_WARN_IF(NS_FAILED(rv))) {
         DoResolve(rv);
         return;
       }
+
+      MOZ_DIAGNOSTIC_ASSERT(INT64_MAX - mDeletedPaddingSize >=
+                            deletedPaddingSize);
+      mDeletedPaddingSize += deletedPaddingSize;
     }
 
-    rv = trans.Commit();
+    // Update padding file when it's necessary
+    rv = MaybeUpdatePaddingFile(mDBDir, mConn, mUpdatedPaddingSize,
+                                mDeletedPaddingSize,
+                                [&trans]() mutable { return trans.Commit(); });
     Unused << NS_WARN_IF(NS_FAILED(rv));
 
     DoResolve(rv);
   }
 
   virtual void
   CompleteOnInitiatingThread(nsresult aRv) override
   {
@@ -793,16 +860,20 @@ private:
 
     for (uint32_t i = 0; i < mList.Length(); ++i) {
       mList[i].mRequestStream = nullptr;
       mList[i].mResponseStream = nullptr;
     }
 
     mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
 
+    if (mDeletedPaddingSize > 0) {
+      DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
+    }
+
     Listener* listener = mManager->GetListener(mListenerId);
     mManager = nullptr;
     if (listener) {
       listener->OnOpComplete(ErrorResult(aRv), CachePutAllResult());
     }
   }
 
   virtual void
@@ -932,16 +1003,19 @@ private:
       MutexAutoLock lock(mMutex);
       MOZ_ASSERT(mCopyContextList.IsEmpty());
     }
 #endif
 
     // Clean up any files we might have written before hitting the error.
     if (NS_FAILED(aRv)) {
       BodyDeleteFiles(mQuotaInfo.ref(), mDBDir, mBodyIdWrittenList);
+      if (mUpdatedPaddingSize > 0) {
+        DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mUpdatedPaddingSize);
+      }
     }
 
     // Must be released on the target thread where it was opened.
     mConn = nullptr;
 
     // Drop our ref to the target thread as we are done with this thread.
     // Also makes our thread assertions catch any incorrect method calls
     // after resolve.
@@ -975,69 +1049,87 @@ private:
   // thread activity is guaranteed complete
   nsTArray<nsID> mDeletedBodyIdList;
 
   // accessed from any thread while mMutex locked
   Mutex mMutex;
   nsTArray<nsCOMPtr<nsISupports>> mCopyContextList;
 
   Maybe<QuotaInfo> mQuotaInfo;
+  // Track how much pad amount has been added for new entries so that it can be
+  // removed if an error occurs.
+  int64_t mUpdatedPaddingSize;
+  // Track any pad amount associated with overwritten entries.
+  int64_t mDeletedPaddingSize;
 };
 
 // ----------------------------------------------------------------------------
 
 class Manager::CacheDeleteAction final : public Manager::BaseAction
 {
 public:
   CacheDeleteAction(Manager* aManager, ListenerId aListenerId,
                     CacheId aCacheId, const CacheDeleteArgs& aArgs)
     : BaseAction(aManager, aListenerId)
     , mCacheId(aCacheId)
     , mArgs(aArgs)
     , mSuccess(false)
+    , mDeletedPaddingSize(0)
   { }
 
   virtual nsresult
   RunSyncWithDBOnTarget(const QuotaInfo& aQuotaInfo, nsIFile* aDBDir,
                         mozIStorageConnection* aConn) override
   {
+    mQuotaInfo.emplace(aQuotaInfo);
+
     mozStorageTransaction trans(aConn, false,
                                 mozIStorageConnection::TRANSACTION_IMMEDIATE);
 
     nsresult rv = db::CacheDelete(aConn, mCacheId, mArgs.request(),
                                   mArgs.params(), mDeletedBodyIdList,
-                                  &mSuccess);
+                                  &mDeletedPaddingSize, &mSuccess);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
-    rv = trans.Commit();
+    rv = MaybeUpdatePaddingFile(aDBDir, aConn, /* aIncreaceSize */ 0,
+                                mDeletedPaddingSize,
+                                [&trans]() mutable { return trans.Commit(); });
     if (NS_WARN_IF(NS_FAILED(rv))) {
       mSuccess = false;
       return rv;
     }
 
     return rv;
   }
 
   virtual void
   Complete(Listener* aListener, ErrorResult&& aRv) override
   {
     mManager->NoteOrphanedBodyIdList(mDeletedBodyIdList);
+
+    if (mDeletedPaddingSize > 0) {
+      DecreaseUsageForQuotaInfo(mQuotaInfo.ref(), mDeletedPaddingSize);
+    }
+
     aListener->OnOpComplete(Move(aRv), CacheDeleteResult(mSuccess));
   }
 
   virtual bool MatchesCacheId(CacheId aCacheId) const override
   {
     return aCacheId == mCacheId;
   }
 
 private:
   const CacheId mCacheId;
   const CacheDeleteArgs mArgs;
   bool mSuccess;
   nsTArray<nsID> mDeletedBodyIdList;
+  Maybe<QuotaInfo> mQuotaInfo;
+  // Track any pad amount associated with deleted entries.
+  int64_t mDeletedPaddingSize;
 };
 
 // ----------------------------------------------------------------------------
 
 class Manager::CacheKeysAction final : public Manager::BaseAction
 {
 public:
   CacheKeysAction(Manager* aManager, ListenerId aListenerId,
@@ -1277,16 +1369,18 @@ public:
                                         &exists, &mCacheId);
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     if (!exists) {
       mCacheDeleted = false;
       return NS_OK;
     }
 
+    // Don't delete the removing padding size here, we'll delete it on
+    // DeleteOrphanedCacheAction.
     rv = db::StorageForgetCache(aConn, mNamespace, mArgs.key());
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     rv = trans.Commit();
     if (NS_WARN_IF(NS_FAILED(rv))) { return rv; }
 
     mCacheDeleted = true;
     return rv;