Be aware, Firefox 98 has a bug in RDD sandboxing that kills vaapi based video decoding (on facebook, youtube, etc), and because of that your .mozilla/firefox/Crash Reports/pending/ folder will be filled with GB’s of unsent crash reports.
More info here: https://forum.manjaro.org/t/firefox-can-no-longer-play-video/105050/9
And here: https://bugzilla.mozilla.org/show_bug.cgi?id=1751363
*the solution is to deactivate vaapi in about:config (media.ffmpeg.vaapi.enabled) while they not fix this bug.