Pls try any of this solution it will give you answer to the problem.
Alt+F brings up the menu bar temporarily just long enough to right click and enable it again.
http://kb.mozillazine.org/Safe_Mode
The menu at the top of the Firefox window includes a Bookmarks item along with other menu items (File, Edit,View, Tools, etc.). In some cases, the menu bar may be missing.
If you don't see the menu bar in Firefox 3.6,
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