Anybody having login issues with Firefox?

Saw an update for firefox (nice new UI) but it seems that I can’t login. It just says "You were unable to login. Please check your cookie settings’. Cookies are enabled, and several have been set by the site already. Oh, and I’ve tried logging out of Chrome but that doesn’t do anything.

So, WTF do I do…

Seems like this guide worked:
https://support.mozilla.org/en-US/kb/websites-say-cookies-are-blocked-unblock-them

Locking.