1. Install, update, then perform a full system scan with MalwareBytes' Antimalware.

• http://www.malwarebytes.org

2. if it's unable to clean the infection, post on the following forum for help.

• http://forums.malwarebytes.org/index.php?showforum=7

3. Also see the full article below.

• Troubleshoot Firefox issues caused by malware

4. You're using the obsolete Firefox 6.0.2, which was released on September 6th 2011. It contains numerous security vulnerabilities that put your computer at risk.

• Update Firefox to the latest release
• https://www.mozilla.org/security/known-vulnerabilities/firefox.html

It may be a program that was "wormed" into your program menu. I've seen that happen. Check your programs and see if that is there. If so uninstall the sucker, see if that helps.

You can check for problems with preferences and rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default value.

• http://kb.mozillazine.org/Preferences_not_saved
• http://kb.mozillazine.org/Resetting_preferences