From MyWOT Web of Trust:
WOT's safe browsing tool warns you about risky sites that can't be trusted: Online shops that cheat customers; download sites that deliver malware; sites that send spam; and those with inappropriate content for kids. Millions of members of the WOT community rate websites based on their experiences, giving you an extra layer of protection when browsing or searching the Web. The WOT add-on provides reputation ratings to search results when you use Google, Yahoo, Bing, Wikipedia and other popular sites. Your Gmail, Yahoo mail and Hotmail account is also protected.
What's new in this version:
Updated interface and improved security and languages.