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Re:Xray – An experimental next-generation Electron-based tex... by rukuu_001 on Tuesday March 06, 2018 @06:37AM (#16528197)
Don't have exact URL, but google 'windowserver high CPU'. Fixing windowserver fixed FF too.
Re:Xray – An experimental next-generation Electron-based tex... by paultopia on Tuesday March 06, 2018 @10:56AM (#16529571)
Interesting. Some kind of animation/repainting thing? This bug[1] seems to be along those lines.

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=1404042