CVE-2009-4101
infoRSS 1.1.4.2 and earlier extension for Firefox performs certain operations with chrome privileges, which allows remote attackers to execute arbitrary commands and perform cross-domain scripting attacks via the description tag of an RSS feed.
Date published : 2009-11-28
https://addons.mozilla.org/en-US/firefox/addons/versions/361#version-1.2.0