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They are working on it: https://github.com/jitsi/jitsi-meet/issues/4758. Unfortunately, I think WebRTC support is still not 100% uniform across browsers (there seem to be a range of browser-specific behaviour and bugs), making it hard to easily support all browsers. And Chrome appears to be the browser which implements new WebRTC features the fastest, so I can understand Jitsi Meet focusing their efforts on that platform.

You don't need chrome though, chromium should be enough.

On Linux it (obviously) also works on chromium, perhaps it also works on the new Edge? FF would be nice though.

Worked on Firefox on Linux for me.