https://bugs.freedesktop.org/show_bug.cgi?id=105117

--- Comment #3 from rcoe-TsGEh1ee8XYAvxtiuMwx3w@public.gmane.org ---
I added the environment variable 
export WEBKIT_DISABLE_COMPOSITING_MODE=1
and I tested running videos.
I ran several videos without issue where before the X server would hang but the
mouse would still move.
I see WebKitWebProcess is using wayland, and it is multi-threaded.

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