Sniffing your browser history

web2.0collage is web app that lets you learn, what web sites you've been visiting. After fetching the data from your internet history, the app presents the list of sites in an inconic mesh, mug, t-shirt etc. Another site that does the same sniffing is How web 2.0 aware are you?, it presents the list as anchor link. How can you prevent this from happening? Recommend using Firefox and the NoScript addon.