Where did Mozilla Persona go?

I did never use an open ID till I wanted to ‘sign in’ into this forum once (and I never used it for another purpose since). Then I decided to use ‘Mozilla Persona’ for this purpose. It worked (rather) well for a while. Now the logo of this oID provider has vanished and I had to log in today twice via check of my email address. does someone know the reason. Is there a way back?

You raise an excellent question and I hope that we get a possibilty to registered without being forced to use FB, Twitter etc. Fortunately I could register through OpenID and can currently recover via email address.