Blocking ads that target us is the main reason we notice privacy invasion. The Mr. Robot extension was an ad, and Mozilla received money to distribute it to their "hacker" base. How is it not an invasion of privacy?
You're conflating different forms of ads. Ads that get your info through trackers are invading your privacy. The Mr. Robot ad is as invading of your privacy as an ad in a paper magazine. It didn't collect your data. Come on don't pretend you don't know how invasion of privacy works.