Librewolf is a fork of Firefox that promises and provides you a privacy focused browser. It blocks out ALL telemetry data collection and enables A LOT of privacy focused features automatically which Firefox does not. It is lightweight with my testing and it handles memory quite well! I enjoy the experience I have with it and have been on and off using it. There are no problems with extensions or Firefox features that I have noticed which is great! I would recommend this to people who do not want to use a chromium based browser, but focuses on Privacy and a great user experience!