Heroku Changelog herokuapp.com added to Public Suffix List

Change effective on 07 June 2013

The DNS domains herokuapp.com and herokussl.com have been added to the Mozilla Foundation’s Public Suffix List

Cookies issued with domain=.herokuapp.com or domain=.herokussl.com may no longer be honored by all browsers. For various reasons, there are no plans at this time to add heroku.com to the list. For more information, see the article Cookies and the Public Suffix List