There are many more ways they can track you. There are things like scroll speed, how fast you type and speed between different letters/etc, how you move your mouse from place to place, etc that they use to identify you. You may notice on some sites you lose your mouse cursor, how you "shake the mouse" to find it is another unique way to identify you. A lot of that technology is used in banking etc, where identification for large transactions is essential and any deviation from those types of things are flagged. There are even more way based on how you use your computer/devices that I am not privy to that they use to uniquely identify you.