How to Create Your Own Firefox 3 Toolbar for Windows
By Scott Orgera, About.com Guide
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Select "Customize" from the Toolbars Menu
Click on View in your Firefox menu, located at the top of your browser window. When the drop-down menu appears, scroll over the option labeled Toolbars. At this point, a sub-menu will appear. Click on the option labeled Customize..., located at the bottom of this sub-menu.