Firefox をカスタマイズしてみようFirefox's toolbar provides easy access to common features. Do you miss something you use a lot? The toolbar is easy to customize. Is there something you don't use all the time? Try adding it to the overflow menu. We'll show you how. Customize the overflow menu or the toolbar You can change the items that appear in the overflow menu or your toolbar. Click the menu button , click and choose . A spec
Mozilla Support
