Firefox not allowing playing of embed videos - how to fix? : r/firefox
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Your Browser Does Not Support MP4 Videos: 3 Ways to Fix It
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html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
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The option to open a mp4 file with Firefox is no longer available since changed to 64 bit, how to fix | Firefox Support Forum | Mozilla Support
I cannot download MP4 video from YouTube in FireFox browser
I cannot download MP4 video from YouTube in FireFox browser
