FireTweaker

With this application you can change some of Mozilla's features: the appearance of the browser and of the pages it displays, services, etc. All of the features are explained when you click on them and, among them, you'll find that you can change the buttons' locations, change the toolbar, use the classic Windows menu style, change the default search mode, and more.

Make Mozilla just the way you like it and surf the Internet your way, at last.