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16" 2020 mbp i9 firefox-only red flickering window fringing _Sometimes_

W

whose

macrumors newbie
Original poster
May 6, 2021
12
0
8 core i9 64gigs ram, catalina

Only when using firefox (official, not community builds).

sometimes moving the mouse cursor or typing causes horizontal lines 50% wider than the underscore character to flicker at the top edge of the window. I use alot [sic] of tabs. Screenshot cannot capture it. Other people have witnessed it.

Is this is me-only issue?
 
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