Redirect tracking goes around Firefox’s built-in third-party cookie-blocking policy by passing you through the tracker’s site before landing on your desired website. This enables them to see where you came from and where you are going.
ETP 2.0 protects you from an advanced tracking technique called redirect tracking, also known as bounce tracking. We will be rolling out ETP 2.0 over the next couple of weeks.
ETP 2.0 clears cookies and site data from tracking sites every 24 hours.
This is good for users. Just one more reason to use Firefox!