SPN vs VPNs

It basically solves this problem: Basic 101 Networking question

What do you do when a banking website doesn’t load and you have many other tabs opened? Or reddit is blocking you because you use a VPN? If you disconnect, I learned that all other tabs will probably see your real IP.

The way I’m doing it right now, is leave the tab that doesn’t load for last. When only that one remains, I disconnect my VPN.

I could also use the solution by Jonah,

but I’d need to download a 4th browser and I don’t think I want to do that.

SPN seems like a great solution, but this

threw me off. Anyone else that uses it can share their experience?