Browser fingerprinting is not new. See also: https://panopticlick.eff.org/ https://panopticlick.eff.org/ "Panopticlick will analyze how well your browser and

Browser fingerprinting is not new. See also: https://panopticlick.eff.org/ https://panopticlick.eff.org/ "Panopticlick will analyze how well your browser and add-ons protect you against online tracking techniques. We’ll also see if your system is uniquely configured—and thus identifiable—even if you are using privacy-protective software." Tor bug #6119 (https://trac.torproject.org/projects/tor/ticket/6119 https://trac.torproject.org/projects/tor/ticket/6119) talking about using this tool specifically for Tor browser. There are also continuous efforts in Tor Browser to remove fingerprintability (e.g. #22127 - https://trac.torproject.org/projects/tor/ticket/22127 https://trac.torproject.org/projects/tor/ticket/22127).