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Mozilla Foundation Security Advisory 2007-17
Title: XUL Popup Spoofing
Announced: May 30, 2007
Reporter: Chris Thomas
Products: Firefox, SeaMonkey
Fixed in: Firefox 22.214.171.124
Chris Thomas demonstrated that XUL popups opened by web content could be placed outside the boundaries of the content area. This could be used to spoof or hide parts of the browser chrome such as the location bar.