Description from the publisher
Headup is a Semantic Web Firefox addon enables you to browse by topics and not by links. Headup finds for you cool & important information about your friends & interests and helps cut down your search time. Connect Headup to the online services you are subscribed to and see how your social circle is related to your tastes & interests. Play the music & videos you discover in Headup's overlay without interfering with you're browsing.