http://coveryourtracks.iykpqm7jiradoeezzkhj7c4b33g4hbgfwelht2evxxeicbpjy44c7ead.onion/about
In 2010, EFF launched this project as “ Panopticlick ,” a research project to investigate how unique each browser is. We gathered information about the configuration and version information from your operating system, your browser, and your plugins, and compared it to our database of many other Internet users' configurations.