My Firefox Browser does not show the Menu Bar (File, Edit, Tools, Help).
I uninstalled Firefox and reinstalled it and I still have no Menu Bar above the URL bar.
Firefox 3.6+ versions have a feature to allow the user to hide the Menu bar.
Hit the Alt key to temporarily show the Menu bar, then open View > Toolbars and select Menu bar, so it has a check-mark.
The F10 can also be used on most PC's to temporarily reveal the Menu bar.