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Hmm, I use Firefox (dev edition) on Linux and the video is playing with no problem

Also works for me, Firefox Nightly on Mac OS.

Really? I'm down-voted for trying to help uncover where it doesn't work?

I can see it in firefox stable under macos

Maybe you use umatrix? You have to allow githubusercontent.com

I can see it in firefox stable under fedora

I could see it with Firefox on iOS

Firefox iOS is just Safari.

Didn't work for me in Safari because Apple stopped updating my iPad. I wish Epic would bring that up at the trial.

You need to install non-free video codecs. It would be great if GitHub recommended using open video codecs for people uploading videos. AV1 would be a good candidate, but Safari still doesn't support it.

It's really not the time to embed AV1 only everywhere.

Lots of hardware around doesn't have hardware video decoding for it. If a free codec is needed, better to use VP8 (or _maybe_ VP9).

(AV1 decoding appeared in hardware for Intel Tiger Lake, NVIDIA Ampere and AMD RDNA2)