I reading up on this JS Browser. I'm thinking to myself it's javascript so you could embed it into a webpage and visit it remotely. It would make proxying pretty easy.
I'm thinking someone will come up with a way to exploit a client and use their browser as a proxy pretty quickly.
Here's the source code: https://github.com/MicrosoftEdge/JSBrowser/
I don't have a lot of time to explore this as I'm in the midst of some other work. But I thought I would go ahead and share the source code.