In short, MinUI lets you configure the way your browser looks like from the Tools menu. To be more exact, for showing or hiding tool bars you can quickly use the MinUI option included in the Tools menu.
Please note that if you choose to hide the scrollbars too, you will not be able to scroll the web pages, and Firefox will re-render them
Note: The MinUI add-on is cross-platform and it works on Mac OS X, Windows and Linux.
