• In Firefox 3.6 versions on Windows and Firefox 4 on Windows and Linux it's possible to hide the "Menu Bar" via "View > Toolbars" or via the right-click context menu of 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
• http://kb.mozillazine.org/Toolbar_customization

Sorry, doesn't help. I have the menu titles all visible, except for one, the Bookmarks title. I can get to my bookmarks using the button, but I want the full menu back! (Partly because I don't know what's going to disappear next)

Do you have the Delicious extension (Tools > Add-ons > Extensions)?

If you have then look at the bottom of the Delicious menu.

See:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Ah!! Geronimo! Thanks