I run a different Mozilla browser but FireFox should be similar to mine.
If I understand you correctly, the menubar in FireFox has changed. What happens if you "right click" your mouse on that menubar? With SeaMonkey I get a dropdown box which has a "Customize" option. Clicking on Customize permits pulling items off the menubar and pushing them back into a different position.
If you are referring to the Win7 desktop and not FireFox, I can't suggest anything.