WOT is said to be one of the best security add-on for Firefox and Internet Explorer. Panda Security recommends to use WOT (Web of Trust) in a layered approach to security. Because, before visiting a suspicious web site, knowing about its behavior is very important. Whatever security precautions you have been taken; still there are chances to an attack just by visiting or clicking a link.
WOT is a community for reputation rating that lets Internet users share their knowledge of websites, helping you stay in control when surfing the Web. It keeps your computer safe from online threats like spyware, adware and viruses and gives warnings about online scams, sites with adult content and spam.
The new version has 4 customizable protections. The Light option is for experienced Web users, Basic option giving warnings only, Maximum Safety stops dangerous Web sites from loading and Parental Control blocks unsafe sites for children. More information and download (via)