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A new install of Fedora 32 on a new computer, new install on Firefox 81.0.1(64 bit). Videos will not play on Facebook.

A new install of Fedora 32 on a new computer, new install on Firefox 81.0.1(64 bit). Videos will not play on Facebook.
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Make sure you have the latest FFmpeg and libavcodec packages installed.

You can check the Web Console for possible media related messages.