As of Firefox 57 I intend to turn PerformanceObserver on by default.
It's been enabled on nightly by default for 16 months. Chrome has
already shipped it since 52, WebKit has implemented it since January
2017, but not shipped yet. Edge has not implemented it yet, but as far
as I know they have
In Firefox 51 I indent to turn PerformanceObserver on by default. It has
been developed behind the dom.enable_performance_observer preference.
Chrome has been shipping it[1]. Their 'intent to ship' is [2].
Bug to turn on by default:
https://bugzilla.mozilla.org/show_bug.cgi?id=1271487
Link to
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