To add more information, I have a video of this although I can't upload it here. Also, frozen youtube tabs NEVER unfreeze.

You can try downloading https://nightly.mozilla.org/ just to see it has any impact. (You'll have no profile, no addons etc. there, so it's like a clean start — its profile is isolated from your current release one)

In case there's an appliance or a security solution interfering along the line, you can also try disabling some protocols (e.g. disabling QUIC in about:config for testing purposes) to see if there's any change.

I'm off to bed and will try the suggested action in the morning. I will say that I forgot to mention that I even uninstalled and then reinstalled firefox and not even that fixed the issue.

Reinstalling the app makes no impact to user data when done correctly, as to not cause any profile loss on reinstall — so that is not a way to try a "clean slate".

Trying a release version in a minimized setup is actually described in Use Troubleshoot Mode in Firefox — the former "Safe Mode" — that's a recommended step if you haven't tried yet.

I haven't tried this yet, but it seems to be spreading... The page wouldn't load until I copied the address into another new tab

Hm, the problem seems to be gone in troubleshooter mode. However, I did already test and find it was not any addon causing the issue, so I have no idea what to do to fix it in non-troubleshooter mode. Is there a way to reset Firefox while keeping bookmarks and addons and such? I tested and the addons are not the problem (I have been using them for a long time with no problem)

Yeah, I have been running it all day in troubleshoot mode with no problem. Now I just need help finding out how to reset my regular browser while preserving bookmarks, passwords, addons, and so on, as those are provably not the problem