Windows 11 Video Playback Issues
Videos don't play in Firefox after updating to Windows 11. They just perpetually load. Playback works fine on Google Chrome, I'm not sure what could be causing this. I tried reinstalling, disabling all extensions, clearing cache, etc. and nothing has worked.
Alla svar (1)
Try the same steps under a different Windows account to see if you have the same issue. You can also try Windows in Safe Mode. https://www.google.com/search?client=firefox-b-1-d&q=windows+10+safe+mode
What security software are you running?