Websites already can barely be assed to care about supporting Firefox users, doing adblocking by default is a great way to get websites to start putting up banners that say "our website does not work with your browser, please switch to Chrome" en-masse.
And Mozilla did develop anti-fingerprinting tech, but they can't enable it by default because it breaks lots of websites and when a website doesn't work they're not going to appreciate Mozilla for protecting them, they're going to be pissed that it doesn't work.
And Mozilla did develop anti-fingerprinting tech, but they can't enable it by default because it breaks lots of websites and when a website doesn't work they're not going to appreciate Mozilla for protecting them, they're going to be pissed that it doesn't work.