This. Since Firefox claims to be a privacy-first browser, it should, by default, use the Arkenfox settings (report spoofed values for language, screen size, fonts, and many other attributes that aid fingerprinting), and include uBlock Origin out of the box.

But it should go even further; the ultimate goal should be for all Firefox users to basically look the same from the point of view of third parties and put an end to tracking in the modern Web.