Ah, the author is Kev Quirk! I really enjoyed his SimpleCSS project: https://github.com/kevquirk/simple.css

I also relate to this post: tried to make Firefox my default browser for years, but slowly Brave became my default browser over time due to its adblocking abilities and general speed.

That said, Brave is a bit of a UI mess out of the box, with too many of their unnecessary "features" like their wallet and crypto BAT stuff being shoved at the user.

I think they're slowly realizing that their user base just wants a straightforward adblocking privacy browser though. They released "Brave Origin" recently, which is a paid app on some platforms, but at least cuts out of all the unnecessary baggage.