Yes, that mesa bug looks about right. Here's a photo I snapped of firefox's address bar. I hit 'a', which brought up history entries in a drop-down list. When I deleted the 'a', the history list is removed, and these pixels were momentarily visible during the repainting.
The static view of firefox is normal enough. The pixeljunk only happens on some screen changes, but not all. Thanks ** Attachment added: "IMG_20200226_154451.jpg" https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1864274/+attachment/5331419/+files/IMG_20200226_154451.jpg -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to mesa in Ubuntu. https://bugs.launchpad.net/bugs/1864274 Title: crunchy pixels To manage notifications about this bug go to: https://bugs.launchpad.net/mesa/+bug/1864274/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp