Cross-site scripting (XSS) vulnerability in the Fizzle 0.5 extension for Firefox allows remote attackers to inject arbitrary web script or HTML via RSS feeds, which are executed by the chrome: URI handler.
https://exchange.xforce.ibmcloud.com/vulnerabilities/33227
http://www.vupen.com/english/advisories/2007/1112
http://www.securityfocus.com/bid/23144
http://www.securityfocus.com/archive/1/463816/100/0/threaded