Bug 1915433 made this perma because it caused gfxPlatform initialization
(thus a bit more work), where before it used to be skipped by a pref.
But this happened intermittently before my patch, so likely this just
pushed the test over the limit...
Given the amount of tests skipped here on tsan, maybe we should have a
higher xpcshell timeout there?
Differential Revision: https://phabricator.services.mozilla.com/D221052
Emilio Cobos Álvarez
7a02ade836