It's worse than selling users off. Pocket was integrated for free and Mozilla later bought Pocket. In essence Mozilla paid to sell it's users. (And I liked "read it later" the extension that saved an offline copy of the website. And was later renamed Pocket and removed that ability).

Same with that hidden spyware ad/extension (distributed using channels reserved for delivering 0day bugfixes). Mozilla shit on it's users without even getting paid for it.