html - Firefox and Chrome can't play HTML5 mp4 video - Stack Overflow
html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
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How to prevent Firefox from playing directly linked MP4 files in the browser – /jdrch
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Firefox won't play many videos, sounds and other Html5 applications but Youtube is fine. | Firefox Support Forum | Mozilla Support
Firefox after updating to 37.0.1 doesn't play youtube videos. | Firefox Support Forum | Mozilla Support
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mp4 works in IE /FireFox but not in Chrome 49 · Issue #3167 · videojs/video.js · GitHub
html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
