On: Panopticlick

It seems that if you set Firefox's privacy.resistFingerprinting to true, it fills those with fake data.

    >>> navigator.deviceMemory
    undefined
    >>> navigator.hardwareConcurrency
    2

privacy.resistFingerprinting has a bunch of useful features (this, letterboxing, etc) that I wish were available under their own dedicated about:config options. I don't want to enable resistFingerprinting because I value being able to use dark mode more.