privacy.resistFingerprinting has potentially-unwanted side-effects, like wiping out most of your browser history (instead of the more sensible approach of just disabling purple links). I also recall something about it getting removed or nerfed, though I'm not sure whether that was a mere proposal.
It does not wipe your browser history. I can definitely attest to that since my generic JS active + resistFingerprinting profile has a history going back years. It does set your timezone to UTC in JS on websites. I've mostly encountered that when playing Wordle ;)
The browser should reasonably know what time zone you're in and what time zone you're reporting to the website and translate between them automatically.
