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Square Corners poking out from Rounded Window Corners

Mark C
Mark C
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On "dark", "light", or "Alpenglow" theme, there are black square corners poking out of the (rounded) window corners - which bugs me.

This is not a problem on "System theme". There are no black squares poking and out it looks perfectly round.

I am running Firefox on PopOS on an Intel NUC, but I have tried it on multiple VMs and experience the same result (92.01).

On "dark", "light", or "Alpenglow" theme, there are black square corners poking out of the (rounded) window corners - which bugs me. This is not a problem on "System theme". There are no black squares poking and out it looks perfectly round. I am running Firefox on PopOS on an Intel NUC, but I have tried it on multiple VMs and experience the same result (92.01).
Attached screenshots

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user4128330
user4128330
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http://mzl.la/1xKrH3y Look over this article. You could also try updating to the newest version of FireFox.