brave/brave-browser ? reverse-engineered prompt

I want to build a web browser like Brave. It should be a cross-platform desktop application for Mac, Windows, and Linux. The browser needs to be incredibly fast and secure, with a strong focus on user privacy. The key feature is that it should block ads and trackers by default, right out of the box.

It should be based on Chromium, but with all the custom Brave features built on top. I know the main brave-browser repository isn't where the code is. The README points to another repo called brave-core for all the source code and build instructions, so you'll need to use that one. Get the project set up for me so I can build and run a desktop version locally.