Get to Know the F11 Key
Here's a quick tip that's useful in Firefox or IE...
Just press the F11 key to temporarily make your browser toolbars disappear so you can see more of your web page. This is especially handy when you use PrintScreen to copy a Web page; unnecessary toolbars are not in the image, and there's more page visible.
Leaving full-screen mode and bringing the toolbars back is easy too: just press F11 to toggle back.