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Mozilla Foundation Security Advisory 2007-33
Title: XUL pages can hide the window titlebar
Announced: October 18, 2007
Reporter: Eli Friedman
Products: Firefox, SeaMonkey
Fixed in: Firefox 18.104.22.168
Mozilla developer Eli Friedman discovered that web pages written in the XUL markup language (rather than the usual HTML) can hide their window's titlebar. It may have been possible to abuse this ablity to create more convincing spoof and phishing pages.