Does this do anything to improve the browser as a user agent? That is an agent that obeys the user over the server. None of the current browsers are user friendly and none are scriptable except by experts wielding large external programs. It should be possible to write a simple shell script to navigate the web, to log in to web sites, to extract information. Or something like Visual Basic.
I guess the closest thing to what you're describing is either conkeror(javascript) or nyxt(common lisp).
The last change to conkeror was in 2019. Does that mean it's complete or that it is abandoned?
Nyxt looks interesting. Perhaps I'll finally have a reason to properly learn Lisp.
But what I was really looking for was a way to use a web browser as a Unix style tool accessible from shell scripts.