I had my suspicions that the issues I've been running into are mostly because of the worsening botting/scraping situation, and in part due to the general very slight preferential treatment Chromium browsers get on the wider Internet, where anything weird coming from Firefox automatically looks more suspicious because it's an underrepresented browser already.
I typically just look up "Firefox Hardening Guide" and follow what looks like the best of the first few results every time I do a fresh install. Because of that, I don't know exactly which guide I followed last, but this one echoes a lot of the steps I remember taking. I've since turned webRTC back on because it kind of broke discord(... I know, I know, discord is terrible for privacy but it's where all my peeps are at!) Didn't tweak everything outlined in guides such as the one linked, but pretty much whenever there was privacy to be gained seemingly without significant website breakage, I'd toggle it.
The user agent thing was bizarre, especially since it was also on Minecraft.net! I swapped to a generic Chrome on Windows agent and it instantly started working again and let me use the site as normal again. That said the user agent thing doesn't always work... But the fact that it does sometimes may be a clue to why websites seem to hate my configuration.
Wouldn't that break relativity tho if you treat the earth as a fixed point? Stuff really far out would have to be going absurdly faster than light to orbit the earth once every 24h. I feel like that's one of the ways to tell whether or not you're rotating, or stuff is orbiting you.