feedWriter in Mozilla Firefox before 2.0.0.17 allows remote attackers to execute scripts with chrome privileges via vectors related to feed preview and the (1) elem.doCommand, (2) elem.dispatchEvent, (3) _setTitleText, (4) _setTitleImage, and (5) _initSubscriptionUI functions.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.