> I'm guessing that means it's actively maintained. I'm guessing it isn't. > Soft U2F is a software U2F authenticator for OS X. It emulates a hardware U2F HID

> I'm guessing that means it's actively maintained. I'm guessing it isn't. > Soft U2F is a software U2F authenticator for OS X. It emulates a hardware U2F HID device and performs cryptographic operations using the OS X Keychain. This tool works with Google Chrome and Opera's built-in U2F implementations as well as with the U2F extensions for OS X Safari and Firefox. That U2F extension link for Firefox is dead because Firefox has it native for a few versions now. about:config -> u2f shows it (I'm on Nightly so not sure its same in current stable).