In Firefox 3.6 on Windows you can hide the menu bar via "View > Toolbars" or via the right click context menu on a toolbar. Press F10 or press and hold the Alt key down to bring up the menu bar temporarily. Go to "View > Toolbars" or right-click the menu bar or press Alt+V T to select which toolbars to show or hide (click on an entry to toggle the state).

See also Restore the Menu bar in Firefox and http://kb.mozillazine.org/Toolbar_customization

The command bar in IE is situated to the right of the tabs. They include the following:- HOME, NO FEEDS DETECTED, READ MAIL, PRINT, PAGE, SAFETY, TOOLS, and ? This command bar is missing in Mozilla Fire Fox. There is a download called VISTA-AERO but it appears to be incompatible in Fire Fox. To me the command bar is useful so I miss it.

            The menu bar is totally different to the command bar. That sits to the  top left of the screen.  It seems to me from the answers that are posted refer to the menu bar. The way that the answers are written are helpful to those that lose the menu bar but is not helpful to the people who are missing the command bar.
             I, like the others who miss the command bar would like a solution to obtaining a compatible command bar in Fire Fox please. Any body have any suggestions please.