Hi! As of 2017-05-15 I intend to turn on throttling of background tracking timeouts by default. It has been developed behind the dom.timeout.tracking_throttling_delay pref. Other relevant prefs are: dom.min_tracking_timeout_value, dom.min_tracking_background_timeout_value, privacy.trackingprotection.annotate_channels. The values and relation to background tracking timeout throttling of these prefs are:
dom.timeout.tracking_throttling_delay pref: the pref that toggles the feature, but also the amount of time that we wait before starting to throttle background tracking timeouts after a document has finished loading. A negative value indicates that the feature is turned off. dom.min_tracking_background_timeout_value: the minimum delay allowed for a tracking timeout from a background window where more than dom.timeout.tracking_throttling_delay pref ms has passed. dom.min_tracking_timeout_value: the minimum delay allowed for a tracking timeout from a foreground window where more than dom.timeout.tracking_throttling_delay pref ms has passed. privacy.trackingprotection.annotate_channels: if annotation of channels based on the tracking protection list is turned on. Also toggles this feature, needs to be true for this feature to be active. The feature is turned on by setting the following default prefs: dom.min_tracking_timeout_value: 4 dom.min_tracking_background_timeout_value: 10000 dom.timeout.tracking_throttling_delay: 30000 All values are in ms. This means that 30 seconds after a document has finished loading, background tracking timeouts will run at most every 10 second. Note that dom.min_tracking_timeout_value is a pref for throttling tracking timeouts for foreground windows, but this is set to the same value as dom.min_timeout_value, which is our minimum timeout delay for regular foreground timeouts. That is, we do not currently treat throttle tracking timeouts differently from other foreground timeouts. The bug tracking turning on this feature is: https://bugzilla.mozilla.org/show_bug.cgi?id=1355311 This feature is similar, but not the same, as https://trac.webkit.org/changeset/215116/webkit, where DOM timers are throttled for all cross origin iframes. We would very much appreciate if we could get feedback on any issues found while you're using nightly! Cheers, Andreas _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
