Mozilla has introduced a lot of tracker blocking protections into Firefox. The Tracking Protections Panel/Protection Report will tell users how many trackers they’ve blocked each day. It will break them down into their various types, including ad trackers, cross-site trackers and fingerprinters. The report should tell you how many times Firefox ran across a tracker that a social media site used to follow you across different third party websites and squished it. Mozilla released the full version of its Enhanced Tracking Protection (ETP) system in June.”]
Source: https://nakedsecurity.sophos.com/2019/07/09/firefox-to-include-tracker-blocking-report-feature/