Firefox has a shitload of tracking features integrated if you don't use the Librefox Profile template. If you don't believe this, add an MITM proxy to verify what's happening on the newtab page.

Personal note: From google analytics in the about:addons view that can only be deleted with physical deletion of the profile folder, to digicert's OCSP service and Google Safebrowsing getting all your cookies, to detectportal.firefox.com tracking all your Geolocation data on every restart... these are all reasons for me to not use Firefox anymore.

That is not privacy respecting. It's what I expect from Google, not Mozilla.