type '''about:config''' in Address bar and search '''browser.startup.homepage''' and change the value to "Google.com" Create a new profile as a test to check if your current profile is causing the problems. See "Creating a profile": *https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles *http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues Profile Backup and Restore *http://kb.mozillazine.org/Profile_backup *https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

If you do not keep changes after a restart or otherwise have problems with preferences, see: *http://kb.mozillazine.org/Preferences_not_saved