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 been interested in.
Bugs to turn on by default on all channels:
https://bugzilla.mozilla.org/show_bug.cgi?id=1386021
Link to standard: https://w3c.github.io/performance-timeline/
Testing: All web platform tests for PerformanceObserver that do not
require Navigation Timing 2
<https://bugzilla.mozilla.org/show_bug.cgi?id=1043083>.
hiro
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