Semanti’s new Firefox add-on uses an 8 million term ontology to aid searchers with their keywords and phrases. Semanti lets you stop searching and start finding the pages you want. It's a simple browser add-on that lets you save your favorite pages to your personal web and improves your search by harnessing your Facebook social network. It enhances and improves the way you search so you get better results with your existing search engine — Google, Yahoo! or Bing. And you can use it from any computer that has the free Semanti add-on installed.

More info: Semanti