U2F or UAF? Firefox is working on adding U2F support, and there&#x27;s a third-party plugin ( <a href="https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-GB&#x2F;firefox&#x2F;addon&#x2F;u2f-support-add-on" rel="nofollow">https:&#x2F;&#x2F;addons.mozilla.org&#x2F;en-GB&#x2F;firefox&#x2F;addon&#x2F;u2f-support-a...</a> ). Not sure if anything supports UAF yet; doesn&#x27;t seem to have the same momentum as U2F.