I am using Firefox 4, and the one thing which annoys me the most is order of my toolbars. I have tried
Customize option but it only lets me move items of toolbar and not the whole toolbar itself. Can anybody please help me with repositioning my toolbar orders?
There's an add on that lets you move toolbars, maybe this helps. It's for 4.08b only, but you can change these requirements and try to install it anyway.
Apart from that, maybe this Firefox Help page will help: "How do I customize the toolbars?"