I am not a web expert but these all sound like things that can uniquely identify a particular browser version only? That doesn't seem like such a big issue - if all that can be determined is that I'm using the latest stable Chrome/Firefox, that doesn't sound so bad. Does it matter that the TOR Browser is identifiable if everyone is using the same version? I thought their goal is to make every user of their browser look the same? Where does the 98.3% accuracy come from?