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Edits to your Firefox profile's userChrome.css file can make all sorts of fun and useful changes to the fox's chrome, menus, dialogs and toolbars. For instance, I've disabled the Forward, Back and Stop buttons unless there's something to go back or forward to or stop, I've made the bookmarks toolbar multi-row to display all my 'marks, and included the bookmark keyword to the Add Bookmark dialog. And this is just a few examples of what can be done.