BrowserID is an authentication mechanism by Mozilla with some similarities to OpenID, but more focused on privacy. [1][2]
MediaWiki should support BrowserID in three user actions: sign in, verify email address, and sign up. See my thoughts on the user interaction at [3].
This should probably be implemented as an extension, with a final goal of being deployed on Wikimedia sites.
It should be able to co-exist with the current password based authentication, while it might be good to be able to disable the password based authentication for new sites.
[1] Website: https://browserid.org/
[2] Wikipedia: https://en.wikipedia.org/wiki/BrowserID
[3] Thoughts on user interaction: https://sv.wiktionary.org/wiki/Anv%C3%A4ndare:Skalman/BrowserID
Version: unspecified
Severity: enhancement