Which Gtk and KDE versions do you have? (bug 1616894) `$ dpkg -l | grep "libgtk-3-common\|kwin-wayland"` The profile contains mozilla::widget::WaylandDispatchDisplays although about:support is KDE/X11. Please reset the following prefs back to their defaults and restart Firefox. Does the problem still occur after that? gfx.webrender.compositor gfx.webrender.compositor.force-enabled gfx.webrender.enabled gfx.x11-egl.force-disabled layers.acceleration.force-enabled layers.gpu-process.enabled layers.mlgpu.enabled layout.frame_rate media.ffvpx.enabled media.gpu-process-decoder media.rdd-process.enabled media.rdd-vpx.enabled widget.wayland_vsync.enabled widget.wayland.opaque-region.enabled (For VAAPI you only need gfx.webrender.all=true, gfx.x11-egl.force-enabled=true, media.ffmpeg.vaapi.enabled=true, media.rdd-ffmpeg.enabled=true and maybe MOZ_DISABLE_RDD_SANDBOX=1 environment variable.)
Bug 1756429 Comment 5 Edit History
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Which Gtk and KDE versions do you have? (bug 1616894) `$ dpkg -l | grep "libgtk-3-common\|kwin-wayland"` The profile contains mozilla::widget::WaylandDispatchDisplays although about:support is KDE/X11. Please reset the following prefs back to their defaults and restart Firefox. Does the problem still occur after that? gfx.webrender.compositor gfx.webrender.compositor.force-enabled gfx.webrender.enabled gfx.x11-egl.force-disabled layers.acceleration.force-enabled layers.gpu-process.enabled layers.mlgpu.enabled layout.frame_rate media.ffvpx.enabled media.gpu-process-decoder media.rdd-process.enabled media.rdd-vpx.enabled widget.wayland_vsync.enabled widget.wayland.opaque-region.enabled (For VAAPI you only need gfx.webrender.all=true, gfx.x11-egl.force-enabled=true, media.ffmpeg.vaapi.enabled=true, media.rdd-ffmpeg.enabled=true and maybe MOZ_DISABLE_RDD_SANDBOX=1 environment variable. (bug 1751363))