(In reply to Erik Kurzinger from comment #13) Please use https://nightly.mozilla.org to reproduce this bug on Gnome X11. Firefox (Gecko engine) needs to set Nvidia env var __GL_ALLOW_FXAA_USAGE=0 because some people enabled FXAA and suddenly had broken rendering when Firefox (Gecko engine) switched from GLX to EGL. But setting that env var causes a performance regression in the driver. Workaround: Enabling "Force composition pipeline" basically reverts the performance regression. Without the workaround, fps is almost as bad as with GLX (bug 1716049 comment 72).
Bug 1736245 Comment 15 Edit History
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(In reply to Erik Kurzinger from comment #13) Please use https://nightly.mozilla.org to reproduce this bug on Gnome X11. Firefox (Gecko engine) needs to set Nvidia env var __GL_ALLOW_FXAA_USAGE=0 because some people enabled FXAA and suddenly had broken rendering when Firefox (Gecko engine) enabled hardware rendering. But setting that env var causes a performance regression in the driver. Workaround: Enabling "Force composition pipeline" basically reverts the performance regression. Without the workaround, fps is almost as bad as with GLX (bug 1716049 comment 72).