If you are reading this article, you are most likely using a web browser, and you have some expectations or beliefs about online privacy and security. It’s called web fingerprinting. I did not think web fingerprinting is serious until I came across a company which is actually selling fingerprinting as a service to other websites. Web Browsers and Web Standards become so complicated that fingerprinting is easier than you think. Given there are companies selling fingerprinting as a service, if you want to really protect yourself from fingerprinting, you should use Tor Browser or Firefox with resistFingerprinting=true .