I'm replying to myself here but to anyone else interested, you can now -- unofficially, as of v57 -- use a U2F-enabled YubiKey in Firefox. See the details on M

I'm replying to myself here but to anyone else interested, you can now -- unofficially, as of v57 -- use a U2F-enabled YubiKey in Firefox. See the details on Mozilla's Wiki [0] (short version: in "about:config", enable "security.webauth.{u2f,webauthn}") and visit Yubico's online demo [1] to test it out. [0]: https://wiki.mozilla.org/Security/CryptoEngineering#Using_U2F_.2F_WebAuthn https://wiki.mozilla.org/Security/CryptoEngineering#Using_U2... [1]: https://demo.yubico.com/u2f https://demo.yubico.com/u2f