Only happens with Firefox, Chromium works fine, but I don’t like to use Chromium. Setting layers.acceleration.force-enabled = true and/or doing prime-run firefox used to fix tearing completley before the 2020-10-01 update, but ever since then neither of these option, nor both combined work anymore…

I had the same problem, but they disappeared when I installed this gnome extension: Disable unredirect fullscreen windows https://extensions.gnome.org/extension/1873/disable-unredirect-fullscreen-windows/ If you are on gnome you might want to give it a try =)

Screen tearing in Firefox fullscreen Youtube videos

Support Graphics & Display

Fabby 11 November 2020 01:25 12

Welcome to Manjaro and please read this:

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