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Firefox 127.0.2 Release Notes
(www.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Not sure. YouTube broke it on their own end -- and conveniently only for Firefox again. 🤔
From what I read last week, basically they were sending chunks of the video stream in a completely invalid way. Essentially saying a new chunk of the video begins at an earlier frame than the last chunk ended.