Can't see video on twitter from Firefox

I’m getting this message from the Console

HTTP “Content-Type” of “video/mp4” is not supported. Load of media resource https://video.twimg.com/ext_tw_video/1230896921767706624/pu/vid/1280x720/wI7op_6fdVmi1MBx.mp4?tag=10 failed. [1234132226541064192](https://twitter.com/i/lists/1234132226541064192)

For example when I try to view the following tweet. Of course the link to YT is correctly shown, that’s not the problem I’m talking about though.

This usually happens if you are missing the right multimedia codec(s). Check out the following documentation.
I’d recommend enabling RPMFusion repository and install codecs from there.

https://docs.fedoraproject.org/en-US/quick-docs/assembly_installing-plugins-for-playing-movies-and-music/

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