By Fingerprinting, you can get the UNIQUE fingerprint of your browser or computer. It based on the basic browser information, GPU, fonts and so on.
http://www.uniquemachine.org/
src - http://www.ghacks.net/2017/02/14/researchers-develop-cross-browser-fingerprinting-technique/
http://www.uniquemachine.org/
src - http://www.ghacks.net/2017/02/14/researchers-develop-cross-browser-fingerprinting-technique/