Recently I spent some time to optimize my FireFox so that I can have maximum working space. The target was to change the FF interface so that it gets closest to Chrome. I used following Firefox addons to accomplish the task.
This addon optimizes your address bar so that all the info you get from your status bar will be accessible through the status bar like hover link, connection status. (no need to have the status bar visible on the bottom. Just disable it from the view menu.)
Removes the mostly useless caption or title bar. This addon also does some other useful tweaks.
Hides the menu bar which can be shown temporarily by pressing the ALT key.