Wanted to mention this seems to be fixed, but I was never able to find a tool that could tell me why it was occurring.

It was ultimately NTP (clock), but it was actually the router clock. I switched PCs and I think my original PC had software to talk to the router, which must've been setting the time. It seems like it changed to a completely different time at some point.

Changed it, then just released/renewed/flushed dns. I also manually turned on the time service at some point and ran a sync from the command prompt just to be safe. and everything is acting normally now.

Did you start with the original Yakuza? Kiwami has a couple things that would feel odd to a newcomer if they don't play 0, and the only reason you're skipping Majima Saga here is because of 0. If you start with 0 then all the context needed for Kiwami 1's additions and Majima Saga are available.

Plus, to be fair, we have had a massive number of newcomers credit to 0. It's probably the favorite in the series now.

I'm not sure what to read from the storage. From what I can see only the cookies are being used. (1 cookie)

Is there a way to tell when each of them are interacting with it?

https://bugzilla.mozilla.org/show_bug.cgi?id=1894286

Update: So far i'm down to 2 extensions:
Ublock
600% sound volume

Memory still ballooned from 1GB to 5GB.

When I checked processes before closing, even after force unloading Youtube under processes, GPU was using around 1 GB. There was literally nothing else I could unload that would stop this.

Again I loaded all tabs just to be fair...GPU is using half of that currently. I'm also questioning the reliability of about:processes to an extent, because I couldn't actually see what was adding up to the 5 GB I was seeing in task manager.

I don't know how to do that.

'Improve Youtube!'
600% sound volume
7TV
Auto Tab Discard
Better TTV
Libredirect
LiveTL
Privacy Badger
Tampermonkey (No scripts enabled)
Ublock
User-Agent Switcher and Manager

i'd say about 40 tabs, mix of:
Danbooru
Youtube
Kbin
Reddit
Amazon
game8.co
libreddit

Plain Firefox