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video related errors in firefox for android - "no video with supported format and mime type" and "video can't be played because file is corrupt" : r/firefox
flash - firefox - this browser does not support video playback - Ask Ubuntu
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Firefox 49 error "This browser does not support video playback" playing mp4 videos in Twitter in Win 8.1 with Flash Player 23.0.0.162 | Firefox Support Forum | Mozilla Support
Ways To fix “Firefox not playing videos”
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