> MOZ_ENABLE_WAYLAND "1" Both Comment 0 (Intel) and Comment 1 (proprietary Nvidia) set this environment variable and apparently use X11. This env var shouldn't be set on X11. It makes only sense on Wayland/Mesa (Intel / AMD / uninstalled Nvidia driver). Please remove this environment variable. Firefox and most other applications and desktop environments don't/can't support Wayland on the proprietary Nvidia driver using the experimental Nvidia-only EGLStreams codepath (bug 1646135), Wayland must be used with Mesa. Ubuntu, for example, doesn't ship Wayland+EGLStreams, but I think I've read somewhere that Fedora might test it (?). (If that's the case and if it were relevant, the Fedora Firefox maintainer and Gtk module owner would have worked on it which I haven't seen.) If removing the MOZ_ENABLE_WAYLAND and rebooting your computer did not help, try this: Click on your user name on your login screen, there should be a button in the bottom-right corner where you select "Gnome on Xorg". Please try that, login, start Firefox, open about:support and check if this failure is gone. (Additionally, if you have verified that GLX works for Firefox, you can open about:config and set gfx.webrender.all to true to force-enable hardware rendering.)
Bug 1678898 Comment 4 Edit History
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> MOZ_ENABLE_WAYLAND "1" Both Comment 0 (Intel) and Comment 1 (proprietary Nvidia) set this environment variable and apparently use X11. This env var shouldn't be set on X11. It makes only sense on Wayland/Mesa (Intel / AMD / uninstalled Nvidia driver). Please remove this environment variable. Firefox and most other applications and desktop environments don't/can't support Wayland on the proprietary Nvidia driver using the experimental Nvidia-only EGLStreams codepath (bug 1646135), Wayland must be used with Mesa. Ubuntu, for example, doesn't ship Wayland+EGLStreams, but I think I've read somewhere that Fedora might test it (?). (If that's the case and if it were relevant, the Fedora Firefox maintainer and Gtk module owner would have worked on it which I haven't seen.) If removing the MOZ_ENABLE_WAYLAND env var and rebooting your computer did not help, try this: Click on your user name on your login screen, there should be a button in the bottom-right corner where you select "Gnome on Xorg". Please try that, login, start Firefox, open about:support and check if this failure is gone. (Additionally, if you have verified that GLX works for Firefox, you can open about:config and set gfx.webrender.all to true to force-enable hardware rendering.)