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> Chrome has supported "U2F" (the first FIDO spec) for a while and all support for Security Keys in the last few years has been via this protocol.

Google U2F to their sites only works in Chrome. You can't use a Yubikey in say Firefox (FF supports it). They way they are making this all work isn't using open common cross browser standards.

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I'm not sure if we're talking about the same exact service, but I'm definitely using a Yubikey with Firefox for Gmail. Not sure if it's enabled by default yet, iirc I had to go into Firefox about:config and twiddle a bit somewhere. What service(s) don't work?

I know there used to be a bug where Google services, as well as some others, used some different code to handle u2f which broke on Firefox. This has been fixed for a while now it seems so I am not sure if this issues still exists.

Support was included starting with FF57, IIRC, although it was disabled by default -- I also enabled it at that time.

Now, in current versions of Firefox, I believe it is enabled by default (starting with FF59?).

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