Open Bug 1445161 Opened 2 years ago Updated 2 years ago
The first window starts as inactive in Mac / Windows
See this workaround: https://searchfox.org/mozilla-central/rev/99df6dad057b94c2ac4d8b12f7b0b3a7fdf25d04/browser/base/content/test/performance/browser_startup_flicker.js#30 And a similar one that bug 1439875 is going to introduce. See also bug 1379355, which could be related.
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