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How to prevent Firefox from playing directly linked MP4 files in the browser – /jdrch
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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
How to Play Mp4 on Firefox in Ubuntu 22.04
FirefoxNightly] H264/MP4 playback not supported · Issue #22 · xhorak/firefox-devedition-flatpak · GitHub
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