Unspecified vulnerability in Wikipedia Toolbar extension before 0.5.9.2 for Firefox allows user-assisted remote attackers to execute arbitrary JavaScript with Chrome privileges via vectors involving unspecified Toolbar buttons and the eval function. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
https://addons.mozilla.org/en-US/firefox/addons/versions/6401#version-0.5.9.2
http://www.vupen.com/english/advisories/2009/3268