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After a tab crash, my firefox started glitching. I tried rebooting and removing and reinstalling firefox's snap.

enter image description here

My Ubuntu is 20.04 and Firefox 85.0.

Random glitches appear on random places of the screen and then disappear when I move the mouse. They don't appear on print screens so I took a photo

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I had the same issues. Upgrading to 20.10 fixed them. Alternatively you might want to try the solutions mentioned under this reddit post

  • Set gfx.webrender.force-disabled to true in about:config and restart Firefox.

or

  • Set the environment variables MOZ_X11_EGL=1
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  • thanks, it works. Gonna wait a little more before accepting, maybe they fix the bug
    – Rafaelo
    Jan 30, 2021 at 0:48

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