GitHub and Twitter say: TOR under MacOS (based on Mozilla Firefox 60.9.0esr) doesn't support security keys about kr-u2f

[antibot4navalny]

Update: I tried:

• enabling security.webauth.u2f
• making sure security.webauth.webauthn_enable_usbtoken is already enabled
• restarting TOR after the above changes
• installing u2f-useragent-adapter addon; expanding its urls to:
  const urls = ['https://github.com/settings/two_factor_authentication/configure', 'https://abs.twimg.com/responsive-web/web/*', 'https://twitter.com/settings/account/*', 'https://www.facebook.com/checkpoint/*'];

...but no luck.

[agrinman]

Is it that Krypton doesn't work but a security key (hardware key) does work?
Or is it just that they don't support security keys with Tor?