I just enabled it to try how it changes the results. Many data points vanished, but suddenly the screen size doesn't show my actual screen size (1920x1080, not very unique) but the size of my viewport (very unique, considering I have a sidebar active). Can somebody confirm this? Why would this setting affect this?
I made the same observation. I also have a sidebar, and after enabling resistFingerprinting, the screen size is a unique identifier for me.
Edit: Here [1] is a relevant link from the mozilla support forum. It links to an old bug report in Tor, and they claim that this actually reveals less information about you. Imo it still makes tracking easier, but I didn't really dig into it.
