In newer versions of Firefox, the javascript options to allow (or not) scripts to perform certain operations on the browser are accessible through about:config Prevent javascript from moving or resizing windows: dom.disable_window_move_resize true: block script, false: allow script Prevent javascript to raise or lower windows: dom.disable_window_flip true: block script, false: allow script Permit javascript to disable context menu (mouse right-click): dom.event.contextmenu.enabled false: block script, true: allow script