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I sometimes see these graphical glitches, only in Firefox, when clicking on some sort of menu. It's only on screen for about half a second (or less) and then the glitch disappears and the menu looks normal. I'm running latest instance of Ubuntu 20.04 and the latest instance of FF but this occurred in earlier builds of FF as well. Wayland, Gnome desktop. I'm running an AMD GPU, stock AMD drivers that ship/install with Ubuntu installation.

I don't see this glitch all the time and I've never seen it in other applications. Has anyone else seen this in Firefox or knows what may be the cause/resolution?

I've never used Firefox before but because of vaapi support I'm using it more often these days than other browsers.

I've included a photo which illustrates what I'm seeing. The image on the left is what a Firefox menu item might look like for a second before the 'glitch' disappears and the menu item looks normal.

enter image description here

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  • Try the 5.8 kernel. It can be installed by sudo apt install linux-generic-hwe-20.04-edge. It has better support of AMD GPUs. – Pilot6 Dec 16 '20 at 21:35
  • Thanks for the suggestion. If kernel 5.8 is the fix I might way until it's officially supported in 20.04 LTS as I don't want to lose LivePatch support. – Angelo M Dec 16 '20 at 21:40
  • Maybe try the default theme? – user3169 Dec 17 '20 at 5:02
  • Interesting suggestion, I actually am using the Default firefox theme. However, I had dark mode enabled for Ubuntu. I've changed the Ubuntu theme to standard. I've kept the firefox theme to default to see if that makes a difference. – Angelo M Dec 17 '20 at 5:13
  • I'm also still encountering this on latest Ubuntu 20.04 with the 5.8 hwe kernel on X with AMD RX 5700. – Mathieu Borderé Apr 20 at 15:27

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