Fóram Tacaíochta Firefox

Firefox version 106.0.1 Windows 11pro. Youtube videos will not play, unless they are Live. Weird. Checked internet. Loads on phone, loads fine in Edge. Restarted FF, cleared cache and cookies, tried private browsing, started in troubleshoot mode with no addons-- even the ad video at the top won't play. What else am I missing? Why will the live videos play but not the others? That seems like a clue, but I've hit the end of my ideas. I was able to watch youtube two days ago, the only change (afaik) is a Firefox update this morning.