Also available for Internet Explorer

Keep yourself safe from spyware, adware, spam, viruses, browser exploits, unreliable online shops, phishing, and other Internet scams. With the free WOT browser add-on, you can easily see the reliability of companies and websites. WOT will warn you and save your computer before you interact with a harmful site.

WOT, Web of Trust, is an online community for reputation rating that lets Internet users share their knowledge of websites, helping you stay in control when surfing the Web. Besides its users, WOT uses hundreds of trusted sources such as phishing site listings to keep you protected against rapidly spreading online threats.

As you search with Google, you will see a tiny icon next to the Web link: green to go, yellow to slow down, red to stop. You can easily customize the protection level to your way of surfing the Web. WOT has information on 20 million websites. WOT ratings are shown also on Yahoo!, Gmail, Wikipedia, Digg, del.icio.us, AOL, and MSN. No registration is required.

Limitations: Firefox 1.5+ required.