Mozilla Firefox 2.0.0.2 allows remote attackers to spoof the address bar, favicons, and document source, and perform updates in the context of arbitrary websites, by repeatedly setting document.location in the onunload attribute when linking to another website, a variant of CVE-2007-1092.

Mozilla Firefox 1.5.0.9 and 2.0.0.1, and SeaMonkey before 1.0.8 allow remote attackers to execute arbitrary code via JavaScript onUnload handlers that modify the structure of a document, wich triggers memory corruption due to the lack of a finalize hook on DOM window objects.