The thing with the FF was it did not support U2F tokens in Linux correctly when I tried it few months ago. U2F requires some "U2F addon" that is incompatible with Quantum.

This is a no-go for me as I have numerous websites secured with Yubikey and without this the browser is just "YT/Facebook viewer"...

As soon as this changes, I might give it another chance.

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EDIT: Oh, FFS I just tried to look it up again and found property "security.webauth.u2f" which seems to be false by default. After enabling it U2F works! Geez, why would you disable that id default -_-