How to Download Youtube Videos as MP4 Using Mozilla Firefox?
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YouTube Downloader – Get this Extension for Firefox (en-US)
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Your Browser Does Not Support MP4 Videos: 3 Ways to Fix It
Your Browser Does Not Support MP4 Videos: 3 Ways to Fix It
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How Can You Fix Videos Not Playing in Firefox
I cannot download MP4 video from YouTube in FireFox browser
Trying to upload an mp4 video to reddit - Do I need a plugin or something? : r/firefox
