Race condition in Mozilla Firefox allows remote attackers to produce a JavaScript message with a spoofed domain association by writing the message in between the document request and document load for a web page in a different domain.
https://exchange.xforce.ibmcloud.com/vulnerabilities/54611
http://www.securityfocus.com/bid/37230
http://securitytracker.com/id?1023287
http://archives.neohapsis.com/archives/bugtraq/2009-12/0104.html