YouTube not streaming after last update. Fixed
I tried every solution posted and then I uninstalled and then wiped Firefox. Nothing helped. It seemed the picture would not sync or just freeze with the sound still playing. I came across an old post to change media.mediasource.enabled. Mine was already set on true. When I changed it to false it solved the problem.
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Thank you for letting us know.
It sounds like your system does not like VP9/AV1 codecs. It would be better to revert media.mediasource.enabled back to default true and install h264ify instead which will give you higher resolution and avoid breaking other sites.
Thanks I noticed the BBC player had stopped working with my fix.