Recently upgraded to version 146.0 on Linux (Mint, Cinnamon) YouTube will work fine when I first start the browser. Eventually videos will stop displaying and sidebar links will not be active. From a separate forum article I cleared all site data and restarted Firefox. That fixes the problem for about 4 or 5 videos, then you need to rinse/repeat. The latest incident seems to have been triggered when I tried to watch a video embedded in an X (Twitter) post. That failed. And the YT failed as a whole. X was open in a separate tab container at the time. While I have both Privacy Badger and uBlock Origin installed, both are deactivated for YouTube. See the attached images. The video is just not displaying, though the screen is reserving space for the player. Both/all videos I have tested do work in Chromium.