Looks interesting (like the expiration=never). Uses Mozilla Persona, which I hadn't heard of before. Apparently 'Persona' is no longer being developed by Mozilla since early/2014(1). Also... warnings that 'Persona' isn't secure for high-value data(2).<p>(1) <a href="http://techcrunch.com/2014/03/08/mozilla-stops-developing-its-persona-sign-in-system-because-of-low-adoption/" rel="nofollow">http://techcrunch.com/2014/03/08/mozilla-stops-developing-it...</a><p>(2) <a href="http://benjamin.smedbergs.us/blog/2014-02-11/dont-use-mozilla-persona-to-secure-high-value-data/" rel="nofollow">http://benjamin.smedbergs.us/blog/2014-02-11/dont-use-mozill...</a>