https://addons.mozilla.org/firefox/2207/

This if you like to look for good pr0n sites or anything else on search engines such as google.

I mean don't you hate clicking it, realizing it's not the right site, and have to click back until you reach the results again.

This extension gets rid of this problem. What it does is that when you see a link you find interest in on of the results pages from a search engine, you roll cursor over it and a little mini window shows you page so you see if you're willing to clik on it. So if it's the wrong site, you can just close the previewer and move on.

SIMPLE!

I usually use my mouse wheel button to open a new tab. If it's the wrong site or w/e, I just click the tab to close it.