I wonder what "Google Killer" is and why you may want it. I did find this add-on but it has rather poor reviews suggesting it may be more of problem than an asset: * https://addons.mozilla.org/firefox/addon/ilovevitaly/ Do you realise you may easily choose which of the built in search engines you use, or even add some special one of your choice. * [[Use popular search suggestions in the Firefox Search bar]] * [[Add or remove a search engine in Firefox]] * [[What is search hijacking?]]