This is great. Hopefully it'll get more people using 2FA. I don't think this is the best security practice, as others are nothing how insecure Android is. But it's better than nothing. It also pushes more people to use FIDO and 2FA. This is for the average person. If you want more get an yubi key or something.
Implementing and maintaining the code in the browser that manages the local BLE channel to a FIDO authenticator is unfortunately a significant undertaking.
We (the team behind this at Google) work actively with FIDO and the W3C on the open standards behind this so that other browsers can support this as well in the future.
I'm very happy with the work and understand it is no trivial feat. But as a FF user I can't really try it out.
> We (the team behind this at Google) work actively with FIDO and the W3C on the open standards behind this so that other browsers can support this as well in the future.
