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Mozilla Foundation Security Advisory 2006-29
Title: Spoofing with translucent windows
Date: April 13, 2006
Products: Firefox, SeaMonkey
Fixed in: Firefox 188.8.131.52
An interaction between XUL content windows and the new faster history mechanism in Firefox 1.5 caused those windows to become translucent. This could be used to construct spoofs that could trick users into interacting with browser UI they can't see. It's possible a clever game-type presentation could persuade an unsuspicious user into some combination of actions that would result in running the attacker's code.
Firefox 1.0 and the Mozilla Suite 1.7 are not vulnerable.
Disable the faster back/forward history:
- Enter "about:config" into the location bar and hit Enter
- Enter "sessionhistory" into the "Filter" text box
- Double-click on
- Change the default "-1" to "0" and hit the OK button
Exploit code and details embargoed during the active update period.