Until this is fixed upstream (apparently in firefox 88, thanks Paweł for
the link), this should work around the problem:
https://bazaar.launchpad.net/~mozillateam/firefox/firefox.hirsute/revision/1478.
** Changed in: firefox (Ubuntu)
Assignee: (unassigned) => Olivier Tilloy (osomon)
** Chang
** Branch linked: lp:firefox
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https://bugs.launchpad.net/bugs/1923116
Title:
Broken WebGL in Firefox 87.0 in xorg session
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I think I've found it.
https://bugs.launchpad.net/ubuntu/+source/firefox/87.0+build3-0ubuntu2
introduced "MOZ_ENABLE_WAYLAND=1" in the startup script (/usr/bin/firefox).
This was to fix #1916469, but unfortunately this breaks WebGL on Xorg.
Removing "export MOZ_ENABLE_WAYLAND=1" fixes the problem
** Attachment added: "about:support from Firefox with broken WebGL"
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1923116/+attachment/5485749/+files/about-support-ff-kubuntu.txt
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