CVE-2007-3827
Mozilla Firefox allows for cookies to be set with a null domain (aka "domainless cookies"), which allows remote attackers to pass information between arbitrary domains and track user activity, as demonstrated by the domain attribute in the document.cookie variable in a javascript: window.
Date published : 2007-07-17
http://www.securityfocus.com/archive/1/473702/100/0/threaded