?
Very easy,just download it!!
micksmixxx
Do you actually mean the Menu Bar or the Bookmarks Toolbar, mate?
Whichever it is, what do you want to know about it?
If it's to make it appear, right-click on a blank area at the top of an open Firefox page and select which option you require by left-clicking on it. (You can have both the Menu bar AND the Bookmarks Toolbar if you wish.)