One of the essential plugins for everyone that care about anonymity when you surf on the web. If you stay on one of the 2 lowest settings you can increase your anonymity dramatically on the web without breaking functionality, so you can surf the web pretty much like everyone else without even noticing it while still staying hard to identify if you for example combine this with VPN. This alone will help but its one of several other key plugins you should install to shield yourself against tracking on the web.