This blogpost starts with me switching of my car radio, and ends with me writing a browser. There is some stuff in between as well.
Interesting take from the author; exactly the kind of thing that might start something big — or maybe it won't, and that's OK, too. Either way, I can appreciate the attitude!
(There's also a discussion on the orange site)
There are literally only chromium-based browsers and Firefox (and its forks) with any meaningful market share. Developing a new browser engine is extremely complicated and time consuming, so there really is no danger of having “too many” browsers. And of course all browsers based on chromium (Google Chrome, Edge, Vivaldi, Brave, …) support the same set of extensions, because they use the same engine. So extension compatibility is also not a problem.
Supporting the gazillion ever-changing web technologies and standards and layout systems for a completly new browser is a problem though.