A bunch of people say Opera GX.
I really, really want to like it, but I'm an IT power user, and it doesnt have any functioning Powershell hooks.
I have a few scripts I threw together to automate my opening and setting up my stream apps and sites in one click. Opera GX might open a specific page if you type it and the URL, but you cant do any other controlling or presetting via Powershell.
So, its Chrome for me.
Some people are going to say "why do that when you can just do X".
Better question; why not just program the app to be Powershell friendly? You're already developing the web browser;... how hard can it be?