http://protonmailrmez3lotccipshtkleegetolb73fuirgj7r4o4vfu7ozyd.onion/blog/browser-device-fingerprinting
Your browser always divulges some information to websites you visit, such as the browser name, operating system, and exact version number of the browser. This is often called passive browser fingerprinting because it happens automatically. In addition to this, websites can ask your browser for additional information, such as a list of supported data types (so-called MIME types), operating system and version, installed fonts, installed plugins, system colors, screen resolution, browser time...