This is wrong. By enabling privacy.resistFingerprinting you cannot make yourself more unique in Firefox because you’re already unique. I would read this guide by the Arkenfox project about fingerprinting. The guy has worked for the Tor browser, so he knows his stuff. The summary is that the privacy.resistFingerprinting is the best tool that Firefox has against fingerprinting, but it can only ”fool naive scripts.” If you’re really worried about fingerprinting and want to defeat advancing fingerprinting, the only option is to use either Tor or Mullvad Browser depending on your threat model.