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When was that? I use a pair of cheap FIDO2 keys with both Firefox and the Linux PAM module. It's hell of a lot more convenient than typing in passwords to unlock LUKS volumes or sign in to web services, that's for sure. I use mini keys though, they barely stick out of USB ports.

Only use mine with Firefox.

That's not true I use mine only with Firefox. And done small companies like Google, Apple, PayPal fully supports Yubikey.