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Solvusoft - "YouTube MP4 Downloader" by ytmp4 is a reliable Mozilla Firefox Addon for downloading YouTube videos. | Facebook
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Video Player – Get this Extension for 🦊 Firefox (en-US)
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html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
I cannot download MP4 video from YouTube in FireFox browser
Video DownloadHelper – Get this Extension for 🦊 Firefox (en-US)
Certain MP4 Videos Breaking - Showing No Codec Error, or Black Screen (Has Screenshots) : r/firefox
Using the HTML5 video player for serving .ogv files in Firefox and Safari, and .mp4 files in Internet Explorer
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Working your magic with Firefox OS - Playing mp4 - fred.dev
How To Convert .mp4 To .webm HTML5 Using Firefox Plugin Firefogg - YouTube
3 Firefox Extensions to Download YouTube Videos - EaseUS
