Anthem.com (one of the health insurance providers for Mozilla Corp.) requires 3rd party cookies be enabled in order to use the messaging feature of their site (to send/receive communications with them). In current Aurora (Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:22.0) Gecko/20130425 Firefox/22.0) this feature does not work given the new default, and I have to manually go and change the cookie settings to allow from all sites. We should get them to fix this.
It requires an account to test. Justin, is still happening? Did you contact them?
Justin is no longer at Mozilla, so I'm guessing he won't be able to follow up on this. Let's close as incomplete.