As much as I hate to say it, Firefox is a privacy mess.

Pocket and Fakespot have very bad privacy policies. The Windows version has a unique Mozilla tracker if you download the installer from the website, and the android version has Google Analytics built in. The existing and new telemetry is a but heavy, but it's anonymised so it's really the lesser of the various evils.

My recommendation is LibreWolf & Fennec as alternatives.