Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes). *Don't make any changes on the Safe mode start window. *https://support.mozilla.org/kb/Safe+Mode *https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes ---- See also: *https://addons.mozilla.org/firefox/addon/searchreset/ *http://kb.mozillazine.org/Unable_to_search_or_add_new_engines *https://support.mozilla.org/kb/remove-toolbar-has-taken-over-your-firefox-search- If this didn't help then try to delete the search.sqlite and search.json files in the Firefox Profile Folder. * http://kb.mozillazine.org/Profile_folder_-_Firefox