Hello, Thank you for your reply. I didn't know graphic rendering specificities of firefox. Thank you for the information.
I opened the bug on libegl-mesa0 because it was the first packet of dependencies list. I using 21.2.1-2 version to try to provide more information for this bug. To reproduce the issue with firefox : - right click on tab and use mouse to fly over tab menu. or - open a web site and browse it down/up On my setup, Firefox seems using basic (software rendering) mode by default. With this basic mode, the issue is present with right click tab and web site browsing I tried to use firefox with Webrender (MOZ_WEBRENDER=1 firefox), right click artifacts are still present, but web browsing doesn't display artifact. When using EGL by MOZ_X11_EGL=1 firefox not working, Basic mode is still used Current mode is checked by about:support and Graphics/Features/Compositing value. I tried to provide a capture of the issue by using screen video recorder "simplescreenrecorder" and when I play the video I cannot see artifact on the video. When using remote desktop by VNC, artifact are not present. This bug couldn't be related between libraries and hardware ? I found newer application with artifact : VLC, simplescreenrecorder Sylvain
