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I cannot download MP4 video from YouTube in FireFox browser
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mp4 Not Playing In Firefox Even With Flash Fallback · Issue #343 · videojs/video.js · GitHub
Firefox 35.0 launches with new Hello video chat and MP4 playback on Mac - Gear | siliconrepublic.com - Ireland's Technology News Service
FirefoxNightly] H264/MP4 playback not supported · Issue #22 · xhorak/firefox-devedition-flatpak · GitHub
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How to prevent Firefox from playing directly linked MP4 files in the browser – /jdrch
Can't download any video file [webm, mov, mp4, etc] · Issue #3703 · mozilla-mobile/fenix · GitHub
html - Why won't MP4 video work with HTML5 <video> tag on Firefox - Stack Overflow
ほのかブログ - のんびり♪ - FireFoxでMP4動画がうまく再生されない？
How to Play Mp4 on Firefox in Ubuntu 22.04
