FireFox VPN browser extension to route some websites via VPN and others not?

I am looking for a browser extension for FireFox that will redirect certain websites via a VPN and not others. Is there a browser extension that can do this, if so which one?

nope, never heard of that

12VPX extension does that, but only if you have a 12VPX account.

There are a few generic proxy extensions as well, which may be able to connect to VPN’s that provide proxies.