It's an experiment in hurting the good will of their brand. I still use Firefox but it's painful sometimes. Not as painful as Chrome, but Mozilla seems determined to come up with unexpected new ways to fuck up Firefox for some reason.
It's simple: $$$$$. Every one of these actions is a short-term cash grab. The real amazing part is how privacy advocates let these transgressions, or what Mozilla calls "experiments", slide.
I see pop up messages that have to be dismissed as harassment, pure and simple.
Firefox has a chance to show it is different from Google but it harasses me just like Google and refuses to hire developers in the same 99% of the world that Google won't hire developers, why should I expect Firefox to be any different from Chrome?
Long-term the answer for us is a migration away from "The Google Platform" and towards Gopher, telnet BBSes, and anything else where hipsters fear to tread.