The Mullvad Browser is a privacy-focused web browser developed in collaboration between Mullvad VPN and the Tor Project. It’s produced to minimize tracking and fingerprinting.
It changes many default Firefox preferences in about:config to be as private as possible. The main selling point is resist fingerprinting (RFP). I highly suggest reading the wiki. It can break some websites, but you can configure it to fit your needs.
1.1 To Arkenfox or Not
Firefox privacy, security and anti-tracking: a comprehensive user.js template for configuration and hardening - arkenfox/user.js