Also in Firefox, once you start tightening up your privacy settings, you'll need to manually make entries to allow cookies for the AH bbs, your bank, online shopping sites etc. Those feature buttons are just above Logins and Passwords. The AH bbs site is a good place to start learning/testing how those work.
Some websites can be a pita and require opening up to ALL tracking, just to review your latest doctor's visit for instance. Personally, that makes those unsecure sites as far as I'm concerned.