Firefox Flatpak H264

Firefox Flatpak requires ffmpeg-full 19.08 to fix choppy playback. It has to be that version (20.08 didn’t work for me). It doesn’t come out of the box and is essential for many popular websites that use h264. In order to fix this:

flatpak install org.freedesktop.Platform.ffmpeg-full/x86_64/19.08

ffmpeg-full version must match app runtime version. Firefox uses 19.08 runtime so only ffmpeg-full 19.08 will work for it.

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