Certain youtube videos won't play in firefox. They just sit there with a loading circle but, they all play fine in Microsoft edge browser.
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FYI, not all browsers works the same. And if you have Addons that one Browser installs doesn't mean another will use it. So this sounds more like Addon issue is blocking the loading. So did you verify disabling all Addons and turn on one on/off to verify none is causing the problem.
I tried turning off all the add ons. Still some videos on Youtube will not play, just a loading circle. Most videos do play though.
Do you by chance have a KN or N edition of Windows 11 ?
Are there media related messages in the Web Console ?
- "3-bar" menu button -> Web Developer or Tools -> Browser Tools -> Web Developer Tools
It seems like you're hit by bug1782322. Can you confirm the issue does persists when you run Firefox in Troubleshooting Mode?
You can try to adjust the video quality (away from auto) or un-maximize and reload the window to force a re-render to see if that makes the video start.