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Firefox won't play MP4 files from the server - Ask Ubuntu
Can't play mp4 with Windows XP, Firefox 45.0 · Issue #3178 · videojs/video.js · GitHub
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DownloadHelper - Video download browser extension
video related errors in firefox for android - "no video with supported format and mime type" and "video can't be played because file is corrupt" : r/firefox
Add Add-ons to Mozilla Firefox on Windows 7 - VisiHow
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Open in VLC media player – Get this Extension for 🦊 Firefox (en-US)
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How can I make mp4 videos play in Firefox? | Firefox-ondersteuningsforum | Mozilla Support
Does Firefox not support mp4 video on websites? | Firefox Support Forum | Mozilla Support
Set Default Download Folder in Mozilla Firefox in Windows 7 - VisiHow
File types and download actions - MozillaZine Knowledge Base
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Windows Media Player Firefox Plugin Download - Essential plugin for firefox users, open Microsoft formats directly in Firefox
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Firefox「Video DownloadHelper」で動画をダウンロード・保存（Windows・Mac）
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