if you want it to not do this, RFP works. if you want RFP but still respecting dark-mode preference, enable privacy.fingerprintingProtection and set privacy.fingerprintingProtection.overrides to +AllTargets,-CSSPrefersColorScheme (it still reports timezone as UTC with this and you can disable that too but I don’t remember how to and don’t care about websites showing time that’s off by an hour for half the year so much)
Living on the East Coast means my radio-controlled atomic wall clock is completely deaf to the atomic (WWVB) signal from Colorado. In the attached video, I am using my smartphone to force the clock to sync to exact Internet time via a clever hardware hack. 1/4