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Firefox Privacy Notice

Mozilla Foundation Security Advisory 2005-35

Showing blocked javascript: popup uses wrong privilege context

April 15, 2005
Doron Rosenberg
Firefox, Mozilla Suite
Fixed in
  • Firefox 1.0.3
  • Mozilla Suite 1.7.7


When a popup is blocked the user is given the ability to open that one popup through the popup-blocking status bar icon and, in Firefox, through the infobar. If the popup URL were javascript: selecting "Show javascript:..." from the infobar or popup blocking status bar icon menus would run the javascript with elevated privileges which could be used to install malicious software.


Do not show blocked popups, or, if you must, show individual popups only if the menu item starts with "Show http://" or "Show https://"