A concept more than a utility Rated 2 out of 5 stars

Indeed as others have mentioned, useless IMO.
Try 'Organize Search Engines' ( https://addons.mozilla.org/en-US/firefox/addon/organize-search-engines/ ), a papa add-on but alive and still efficient (FF 3.6 and above) !

This review is for a previous version of the add-on (0.1.0).