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Firefox itself from mozilla.org is not made to do this as this is likely due to one or more Extensions you have installed as look at the toolbar related ones especially as the Conduit ones are usually Toolbars. Tools >Addons>Extensions Also download dot com aka cnet is a known adware site so if you downloaded anything from them recently then that could be to blame. http://en.wikipedia.org/wiki/Download.com#Adware . ---- Also in credit to cor-el: You can check in "Windows Control Panel > Programs" for recently installed programs to see if anything from Conduit or any other suspicious software shows up. *Control Panel > Programs > Programs and Features > Uninstall or change a program *Click the Installed column to sort by this heading ---- You can check the target line in the Firefox desktop shortcut (right-click: Properties) to make sure that nothing is appended after the path to the Firefox program. ---- You can open the <b>about:config</b> page via the location bar and search for prefs that refer to <b>conduit</b> and reset related user set (bold) prefs via the right-click context menu to the default value. If you do not keep changes after a restart or otherwise have problems with preferences, see: *http://kb.mozillazine.org/Preferences_not_saved