They seem to be basing the behavior on the Tor Browser which is described here: https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-

They seem to be basing the behavior on the Tor Browser which is described here: https://blog.torproject.org/browser-fingerprinting-introduction-and-challenges-ahead/ https://blog.torproject.org/browser-fingerprinting-introduct... The Mullvad Browser download page has this to say: "Strong anti-fingerprinting from the Tor Project The Tor Project has a proven track record of building a privacy-focused browser. The Mullvad Browser has the same fingerprinting protection as the Tor Browser – it just connects to the internet with (or without) a VPN instead of the Tor Network."