The only thing that has a chance of happening is some external party coming up with a different protocol or extending the existing one, and gaining traction as an identity provider. Then, like we did with Pocket and &quot;Save for Later&quot;, it&#x27;s not unreasonable to think that Firefox would accept a system add-on that is compatible with this protocol to ship an in-browser UI.<p>&quot;gaining traction as an identity provider&quot; being the hard part, of course.