Firefox still doesn't work.
1 - Google Meet consumes 40%-100% of my CPU on Firefox, and my laptop becomes a space heater
2 - My Yubikeys don't work. Touching them doesn't get into any of the websites I use that use 2FA.
So, no Firefox.
Yes, Linux.
No site works for me. Facebook, Google, none of them work. Even the demo at https://demo.yubico.com/webauthn-technical/ does not work.
Well, mine doesn't work, so I'm still using Chrome. When they make it work, I'll switch to Firefox. There should really be a big fat "report bug" button on all these apps that captures logs and sends it with 1-click permission and a voice recording to explain what's wrong, like Tesla FSD's bug reporting system. I don't have bandwidth to deal with their community forums and all the crap it takes to register for them.
Is this on Linux? Do you have an example of a website where Yubikey does not work? I'm curious, because I use Firefox on Linux for years, also for work, and never hit a site where my Yubikeys would not work. (I'm also using Google Meet regularly for work from Firefox without problems)