I recently got a U2F Zero, a tiny (about 2 inches long) and cheap (about 8 dollars) device implementing the FIDO Universal Second Factor protocol. It’s open source, too, which is awesome. A close-up shot of the U2F Zero. I primarily use Firefox. Unfortunately, Firefox doesn’t support U2F out of the box; you have to enable security.webauth.u2f in about:config. Once enabled, I tried to register it with GitHub. Unfortunately, it kept on failing, despite the little green light on the U2F Zero...
