My Asus Eee PC 701 is a brilliant low-cost ultraportable notebook, but it has a really small screen (seven inches diagonally). I needed to find out how to make the best use of the available area when I was using the Firefox Web browser. I used F11 to toggle the browser's built-in full screen mode, in which a modified navigation toolbar and optional tab bar are all that is displayed above a Web page, but I yearned for something even better. I found two add-ons that could meet my needs.
With the FullerScreen extension, when you press the F11 key the current Web page is displayed over the entire screen -- no menus or toolbars. If you move the mouse pointer to the top or bottom of the screen area, the extension will display a full screen navigation bar, the status bar, and, if appropriate, the tab bar.