Google Chrome just introduced a cool feature which lets you maximize the browser space you have by letting you easily show/hide the address bar.
Firefox is not be out done by Chrome for long.
With the Firefox extension – LessChrome HD, you can get the same show/hide address bar feature in Firefox. Once installed (no restart required in FF4), the address bar will hide itself. Just mouse over that area or use the assigned keyboard shortcut to open the address bar.
Don’t forget to check out my best Firefox add-ons list.
How to Enable Auto-Hide in Google Chrome
Just type, about:flags in the address bar, scroll down and enable ‘Compact Navigation‘ to enable this feature.