We already have "no compromises" forks / side-versions of Firefox. FF cannot pull a Steam because they don't have a big enough userbase, and the userbase won't grow if they are too purists, sadly. Firefox lost the battle to Chrome over 10 years ago, partly due to its faults (it was heavy and slower to load that back in the day Chrome) and also because Google shoved Chrome down its users' throat (I perfectly remember the Chrome banner in Google's home page, not even SERP).