Hmm, I do see the light strip at the bottom of Firefox 90b4 "about" dialog, but I actually see it in Firefox 89 as well. See attached screenshot. Nightly is still looking good. I'm wondering if maybe there's a strong dependency on the exact content of the `about` dialog here (additional text may introduce an additional fractional CSS-pixel height, which may produce a one-display-pixel-tall unpainted strip, in HiDPI environments, I guess?) In any case: I would classify Firefox 90 b4 as affected, but it seems 89 was just as affected, which means this artifact isn't really the same as the Nightly-specific regression that I had reported here (which was fixed).
Bug 1708033 Comment 11 Edit History
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Hmm, I do see the light strip at the bottom of Firefox 90b4 "about" dialog, but I actually see it in Ubuntu's packaged Firefox 89 release build as well. See attached screenshot. Nightly is still looking good. I'm wondering if maybe there's a strong dependency on the exact content of the `about` dialog here (additional text may introduce an additional fractional CSS-pixel height, which may produce a one-display-pixel-tall unpainted strip, in HiDPI environments, I guess?) In any case: I would classify Firefox 90 b4 as affected, but it seems 89 was just as affected, which means this artifact isn't really the same as the Nightly-specific regression that I had reported here (which was fixed).