The main problem with Persona was not the tech, Persona is great and works well. The problem is that building federated identity services is hard. Persona is not a centralized login system such as &quot;login with Facebook&quot;. With Persona, once you decide to login with your email account, first Persona looks for an IdP with your domain&#x2F;provider, the if not found it goes back to the persona catchall service. For a while gmail.com had support for Persona as well and it worked transparently. I don&#x27;t know if that is still the case.<p>What killed Persona was not tech but the lack of traction. Developers loved it but failed to use it. By providing options such as FB, Google, Twitter and other logins, the user choose the familiar service and never tried Persona. In the end, the lack of traction together with the overall difficulty of building federated identity services killed it.<p>But what is dead cannot die! Persona still works, I still use it every day in lots of Mozilla properties and if I had to build some service that required logins, I would use it even today. It is in the hand of the community but with some care and more traction this can become cool again.<p>I will look into the source code and see if I can help somewhere.