--- a/mobile/android/app/mobile.js
+++ b/mobile/android/app/mobile.js
@@ -861,15 +861,19 @@ pref("reader.color_scheme", "auto");
 pref("reader.color_scheme.values", "[\"dark\",\"auto\",\"light\"]");
 
 // Whether to use a vertical or horizontal toolbar.
 pref("reader.toolbar.vertical", false);
 
 // Whether or not to display buttons related to reading list in reader view.
 pref("browser.readinglist.enabled", true);
 
+// Telemetry settings.
+// Whether to use the unified telemetry behavior, requires a restart.
+pref("toolkit.telemetry.unified", false);
+
 // Selection carets never fall-back to internal LongTap detector.
 pref("selectioncaret.detects.longtap", false);
 
 // Enable Service workers for Android on non-release builds
 #ifdef NIGHTLY_BUILD
 pref("dom.serviceWorkers.enabled", true);
 #endif

--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -760,24 +760,28 @@ pref("toolkit.autocomplete.richBoundaryC
 pref("toolkit.osfile.log", false);
 
 pref("toolkit.scrollbox.smoothScroll", true);
 pref("toolkit.scrollbox.scrollIncrement", 20);
 pref("toolkit.scrollbox.verticalScrollDistance", 3);
 pref("toolkit.scrollbox.horizontalScrollDistance", 5);
 pref("toolkit.scrollbox.clickToScroll.scrollDelay", 150);
 
+// Telemetry settings.
+// Server to submit telemetry pings to.
 pref("toolkit.telemetry.server", "https://incoming.telemetry.mozilla.org");
 // Telemetry server owner. Please change if you set toolkit.telemetry.server to a different server
 pref("toolkit.telemetry.server_owner", "Mozilla");
 // Information page about telemetry (temporary ; will be about:telemetry in the end)
 pref("toolkit.telemetry.infoURL", "https://www.mozilla.org/legal/privacy/firefox.html#telemetry");
 // Determines whether full SQL strings are returned when they might contain sensitive info
 // i.e. dynamically constructed SQL strings or SQL executed by addons against addon DBs
 pref("toolkit.telemetry.debugSlowSql", false);
+// Whether to use the unified telemetry behavior, requires a restart.
+pref("toolkit.telemetry.unified", true);
 
 // Identity module
 pref("toolkit.identity.enabled", false);
 pref("toolkit.identity.debug", false);
 
 // AsyncShutdown delay before crashing in case of shutdown freeze
 pref("toolkit.asyncshutdown.timeout.crash", 60000);
 

--- a/toolkit/components/telemetry/docs/index.rst
+++ b/toolkit/components/telemetry/docs/index.rst
@@ -14,8 +14,9 @@ Client-side, this consists of:
 
 .. toctree::
    :maxdepth: 2
 
    pings
    common-ping
    environment
    main-ping
+   preferences

new file mode 100644
--- /dev/null
+++ b/toolkit/components/telemetry/docs/preferences.rst
@@ -0,0 +1,17 @@
+Preferences
+===========
+
+Telemetry behaviour is controlled through the following preferences:
+
+``toolkit.telemetry.unified``
+
+  This controls whether unified behavior is enabled. If true:
+
+  * Telemetry is always enabled and recording *base* data.
+  * Telemetry will send additional ``main`` pings.
+
+``toolkit.telemetry.enabled``
+
+  If unified is off, this controls whether the Telemetry module is enabled.
+  If unified is on, this controls whether to record *extended* data.
+  This preference is controlled through the `Preferences` dialog.