Tell firefox to use Flash player instead of download for mp4 files - Super User
Previewing mp4 files instead of saving them to PC. | Firefox Support Forum | Mozilla Support
Easily download Youtube videos as MP4 or FLV with Firefox and a plugin - YouTube
Firefox: VLC Media Player not listed as content type - Microsoft Community
Clear Browsing History in Mozilla Firefox in Windows 7 - VisiHow
Open in VLC media player – Get this Extension for 🦊 Firefox (en-US)
Can't get audio when playing mp4 video within Firefox? : r/firefox
How can I make mp4 videos play in Firefox? | Firefox Support Forum | Mozilla Support
Video converter online VideoConvertPlus – Get this Extension for Firefox (en-CA)
Why is it so difficult to get Firefox to play web videos? | Firefox Support Forum | Mozilla Support
What YouTube Downloader is Right for You? | Mozilla Add-ons Community Blog
Firefox and Chrome can't play HTML5 mp4 video - Stack Overflow
YouTube Downloader – Get this Extension for Firefox (en-US)
Free Video Downloader – Get this Extension for 🦊 Firefox (en-US)
Road-Test sending video to Chromecast and Roku in Firefox for Android Beta - Future Releases
Firefox won't play MP4 files from the server - Ask Ubuntu
How to enable MSE & H.264 support on YouTube for Firefox right now - gHacks Tech News
How to Download Online Videos using Firefox Add-ons?
YouTube Download Plus – Get this Extension for 🦊 Firefox (en-US)
Videos won't play in Nightly | Firefox Support Forum | Mozilla Support
How to prevent Firefox from playing directly linked MP4 files in the browser – /jdrch
HLS/MP4/etc Video Playback (Unless of course, Microsoft Windows 10 Media Feature Pack was included) not working or playing or (re)loading (example: Twitter, or et cetera, or other) in Windows 10 Safe Mode :
