Without Lisp, or something very like it (and javascript is not good enough), I would not use emacs.
I use emacs as a source navigation and exploration tool, even more than for text editing. Its ability to run code customized to the language and projects I'm working on is far more important than its ability to edit text.
I actually don't like a lot of its text editing functionality, and had to work hard to get things like selection, tab indenting, scrolling etc. to work in a way that didn't drive me up the walls. I had to give up on virtual space, one of the things that stopped me learning it 10 years ago. It's also very hard to record keyboard macros without accidentally cancelling (I tend to press C-g reflexively when I type a wrong shortcut); I use multiple cursors these days instead, even though that is much riskier / harder to use when you can't see the whole buffer / all edit locations on screen at once.
A browser, I don't really need that per se - unless it's linked to library documentation. But it's hard to integrate modern docs without at least understanding HTML, if not HTTP. So I can see the need for a browser implementation.