i use FF too, and it seems to me that you're trying to change around the icons and what not... I do that a lot too..
What i do is go to "view" tab and straight to "toolbars..." then click on "customize.."
it should come up with popup.
on another note, you do know that you can put any icon or things in other toolbars.
for example: "back" and "forward" icons in the bookmark toolbar...?
What I've done: everything that I want is on my bookmark toolbar.. i dont show any other toolbars and i still am able to see my "file, edit, view" etc, as well as all the wanted icons and bookmark icons. (they were included onto the bookmark toolbar)
Hopefully you can follow all of that.... good luck