BEST Firefox Add-On

blocks every Pop-Up (see more)

Skins and Styles for Firefox. Only click at the one you want and thats it. You also can create your own ones too.
But be carefull: It only works with existing internet connection. (see more)

I like it because it tell you what kind of websites that are dangerous to go on by the color of rings you see. It's like a stoplight. Green - Good, Yellow- Watch out, Red - Stop  (see more)