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+Preferences
+===========
+
+Telemetry behaviour is controlled through the preferences listed here.
+
+Default behaviors
+-----------------
+
+Sending only happens on official builds (i.e. with ``MOZILLA_OFFICIAL`` set) with ``MOZ_TELEMETRY_REPORTING`` defined.
+All other builds drop all outgoing pings, so they will also not retry sending them later.
+
+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.
+
+  Note that the default value here of this pref depends on the define ``RELEASE_OR_BETA`` and the channel.
+  If ``RELEASE_OR_BETA`` is set, ``MOZ_TELEMETRY_ON_BY_DEFAULT`` gets set, which means this pref will default to ``true``.
+  This is overridden by the preferences code on the "beta" channel, the pref also defaults to ``true`` there.
+
+``datareporting.healthreport.uploadEnabled``
+
+  Send the data we record if user has consented to FHR. This preference is controlled through the `Preferences` dialog.
+
+``toolkit.telemetry.archive.enabled``
+
+  Allow pings to be archived locally. This can only be enabled if ``unified`` is on.
+
+``toolkit.telemetry.server``
+
+  The server Telemetry pings are sent to.
+
+``toolkit.telemetry.log.level``
+
+  This sets the Telemetry logging verbosity per ``Log.jsm``, with ``Trace`` or ``0`` being the most verbose and the default being ``Warn``.
+  By default logging goes only the console service.
+
+``toolkit.telemetry.log.dump``
+
+  Sets whether to dump Telemetry log messages to ``stdout`` too.
+
+Data-choices notification
+-------------------------
+
+``toolkit.telemetry.reportingpolicy.firstRun``
+
+  This preference is not present until the first run. After, its value is set to false. This is used to show the infobar with a more aggressive timeout if it wasn't shown yet.
+
+``datareporting.policy.firstRunURL``
+
+  If set, a browser tab will be opened on first run instead of the infobar.
+
+``datareporting.policy.dataSubmissionEnabled``
+
+  This is the data submission master kill switch. If disabled, no policy is shown or upload takes place, ever.
+
+``datareporting.policy.dataSubmissionPolicyNotifiedTime``
+
+  Records the date user was shown the policy. This preference is also used on Android.
+
+``datareporting.policy.dataSubmissionPolicyAcceptedVersion``
+
+  Records the version of the policy notified to the user. This preference is also used on Android.
+
+``datareporting.policy.dataSubmissionPolicyBypassNotification``
+
+  Used in tests, it allows to skip the notification check.
+
+``datareporting.policy.currentPolicyVersion``
+
+  Stores the current policy version, overrides the default value defined in TelemetryReportingPolicy.jsm.
+
+``datareporting.policy.minimumPolicyVersion``
+
+  The minimum policy version that is accepted for the current policy. This can be set per channel.
+
+``datareporting.policy.minimumPolicyVersion.channel-NAME``
+
+  This is the only channel-specific version that we currently use for the minimum policy version.
+
+Testing
+-------
+
+The following prefs are for testing purpose only.
+
+``toolkit.telemetry.initDelay``
+
+  Delay before initializing telemetry (seconds).
+
+``toolkit.telemetry.minSubsessionLength``
+
+  Minimum length of a telemetry subsession (seconds).
+
+``toolkit.telemetry.collectInterval``
+
+  Minimum interval between data collection (seconds).
+
+``toolkit.telemetry.scheduler.tickInterval``
+
+  Interval between scheduler ticks (seconds).
+
+``toolkit.telemetry.scheduler.idleTickInterval``
+
+  Interval between scheduler ticks when the user is idle (seconds).
+
+``toolkit.telemetry.idleTimeout``
+
+  Timeout until we decide whether a user is idle or not (seconds).