Is there something in Firefox's license that prevents forking? Why does it seems like all of these browser are always Chromium forks and we never see Firefox forks go mainstream?

> using yet another Chromium based browser doesn't really improve the current situation with Google's browser monopoly

It's not a monopoly if you can build your own with it. This is like saying glibc is a monopoly.

Billions of people use non-Google web browsers every day. Monopoly does not mean "company or product I don't like".

>but using yet another Chromium based browser doesn't really improve the current situation with Google's browser monopoly.

Not everyone wants to be a martyr/activist to change their habits and experience in order to support a political cause they don't really understand.

Most people just want the best, frictionless and most familiar experience to the product they already know and love, which often means a slick and shiny product from a monopolistic anti-consumer company.