The Menu bar by default is disabled for Mozilla Firefox. This menu bar includes options for File, Edit, View, History, Bookmarks, Tools and Help. This guide will show you how to re-enable this menu bar. Here is how to enable this:1. To begin, open the Firefox browser on your PC. If you do not have a Desktop shortcut or pin for this on your taskbar, click on the Start icon, typically found at the lower left corner of the screen. Look for Firefox from the list of applications and click on it to open up the browser. 2. With Mozilla Firefox open, click the Menu button (three vertical lines) at the top right of the program. 3. From the list of Menu options, select Customize. 4. A new tab will appear for “Customize Firefox”, at the bottom, click on Toolbars. 5. A drop-down menu will appear under “Toolbars”, click on the option for Menu Bar. 6. The Menu bar will now appear at the top of the Firefox window.