Toggle Krypton extension on and off about kr-u2f

[rpendleton]

I agree that some way of disabling the extension or changing its priority would be good.

When my phone is dead or doesn't have service/wifi, the extension seems to just hang and never falls back to my hardware key. If I already have my hardware key plugged in, I'd actually prefer to use that instead of my phone since it's usually quicker and more convenient.

[agrinman]

@phillipseamore the extension falls back to the physical key if a Krypton key has not been added to the account. If you're experiencing weirdness around this there may be a bug somewhere. Is the extension preventing your hardware key from working on an account that Krypton has not been added to?