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HELP FACEBOOK VIDEOS DO NOT WORK ON FIREFOX (EVEN LATEST VERSION) | Firefox Support Forum | Mozilla Support
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No video with supported format and MIME type found." on videos native interface can play · Issue #1590 · nolanlawson/pinafore · GitHub
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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 | Forum pomocy dla programu Firefox | Pomoc Mozilli
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