Unfortunately, Firefox is the best browser you’re going to get under capitalism/Silicon Valley.
Thankfully, we can do so much better than capitalism/Silicon Valley.
If we want a browser owned and controlled by the people, we must fund an organisation owned and controlled by the people to build and maintain it. (So, for example, an independent org funded by our taxes.)
And, hey, they don’t even have to start from scratch. They can, for example, fork Firefox. ;)