Yes, people want this.

This is not true. I want a big standard library and I am more than willing to deal with the downsides just like i have with python.

Batteries included ia the only sane way to do programming languages.

Couldn't this be implemented as a web extension? I imagine modifying singlefile to automatically send html to a local port is much easier than trying to convince a chronically mismanaged organization like mozilla (no offence to mozillians).