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Firefox will not play MP4 videos all of a sudden. Not sure what I'm doing at all. : r/firefox
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Firefox 110 won't play embedded .mp4 video using the <video> element : r/ firefox
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html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
7 Proven Ways to Fix Videos Not Playing in Firefox
File types and download actions - MozillaZine Knowledge Base
