The menu button
gives you convenient access to your favorite Firefox features. Don't like the default arrangement? It's easy to customize. Is there something you use all the time? Try adding it to the main toolbar. We'll show you how.
You can change the items that appear in the menu or your toolbar.
Click the menu button
and choose Customize.
A special tab will open which allows you to drag and drop items in or out of the menu and the toolbar. Feel free to experiment with what works best for you. You can always start over by clicking the Restore Defaults button at the bottom of the screen.
When you are done, click the green Exit Customize button.