From the article: "Web browsers leave an essentially unique footprint every time you visit a web page, even in Incognito mode (and even without supercookies).

From the article: "Web browsers leave an essentially unique footprint every time you visit a web page, even in Incognito mode (and even without supercookies). This is well established; many web tools such as Panopticlick will confirm that you give a website lots of information about your computer every time you visit."