To show the menu bar in firefox

Windows Method 1. Hold down the {ALT} key and press the following letters in this exact order: V T M
Windows Method 2. Press and release the {ALT} key. The Menu Bar will be displayed; then choose View > Toolbars and click on Menu Bar.
The Menu Bar should now be displayed permanently, unless you turn it off again using View > Toolbars. Check mark = displayed, NO check mark = not displayed.