[kybernetikos]

My Ledger Nano supports fido u2f and manages blockchain wallets, so I presume you're just asking for an open version of that?

Maybe the ease of use isn't quite where it could be.

[jillesvangurp]

Yes, I'd feel more comfortable with something that is end to end auditable without any secret/proprietary stuff.

Also the Nano does some of that but doesn't work with e.g. Firefox. I have to use Chrome to be able to do anything with it.

[kybernetikos]

I use Firefox nightly, and flick the security.webauth.u2f configuration setting.