Becoma a Persona issuer / identity provider
 

https://www.persona.org/ is a distributed login system doing away with the need for site-specific passwords, where a site checks with the email provider itself for whether the browser is the owner of a certain email address.

Currently, Mozilla acts as a stand-in for that verification for email providers that haven't yet become identity providers, but it would be even distributeder if Fastmail could do it :-)

See https://developer.mozilla.org/en-US/...apping_Persona

"We expect email providers to act as an IdPs for the addresses they administer, making the user experience of Persona seamless for those users. It allows the user to leverage their existing relationship with the email provider when authenticating at other sites. … In the meantime, Mozilla operates a fallback IdP at https://login.persona.org"

Ditto. This would be an incentive to upgrade.