These types of articles are silly in that they leave out the context that nearly every variable that is pseudo-unique to you is already being used and that this is a common practice known as fingerprinting that has been done since forever. Headline: "New variable x can be used to track you". Well, yea. Add that to the size your browser window is, what plugins you have installed, your IP address, and many more ways a website can use to surmise a relationship between two disjoint events.