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The only issues I've had with Firefox is when some websites, like Teams, doesn't "support" it. Even though if you change the browser's identifier (there's an extension for that) then it works fine, they just don't "officially support" it.
I'm also like 90% sure that "we don't support it" is artificial, been meaning to test it.
My Firefox install at the office works fine with Teams but will refuse to load at home. I think it might be a version issue, but I'll try to establish parity to make sure it's not Microsoft being fucky thinking they can shaft anyone using Firefox/Linux outside of the office.
One workaround has been to spoof your Firefox user agent so Teams believes it's Chrome, and would you believe it the feature worked. I don't know if this trick is still relevant.
This does not work with the message I was encountering, which is what originally made me suspect fuckery may be afoot...