Mozilla Persona login service will officially close on 30 November, and must therefore remove it from FreshRSS:

• https://wiki.mozilla.org/Identity/Persona_Shutdown_Guidelines_for_Reliers
• https://groups.google.com/forum/#!msg/mozilla.dev.identity/mibOQrD6K0c/kt0NdMWbEQAJ