he/him 
Seriously, @Google sniffs your user-agent (and doesn't allow Firefox) before letting you set up a Yubikey? What is this, 2003?
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yeah. Apparently you just can't set it up in FF, logging in is fine.
I set up a U2F Ubikey with Firefox. I had to enable U2F in the ubikey settings and change the y2f flag in about:config
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Huh, didn't work for me. The yubico test page and GitHub worked fine, but Google and Dropbox didn't.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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