http://coveryourtracks.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/about
Running tests on Cover Your Tracks gives you information about your own browser’s privacy protections, and also helps EFF use statistical methods to evaluate the capabilities of third-party trackers and the best forms of protection against them. In 2010, EFF launched this project as “ Panopticlick ,” a research project to investigate how unique each browser is.