Can't download any video file [webm, mov, mp4, etc] · Issue #3703 · mozilla-mobile/fenix · GitHub
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I cannot download MP4 video from YouTube in FireFox browser
FirefoxNightly] H264/MP4 playback not supported · Issue #22 · xhorak/firefox-devedition-flatpak · GitHub
How To Download Youtube Videos On Firefox | Robots.net
