Relax, man. It's perfectly reasonable to say that you would stop using a browser if they killed adblock support. Saying so is not "tough guy" syndrome because switching which browser you use is not a tough thing to do.
It is tough guy syndrome, because it's projecting a hypothetical scenario to performatively declare what you would do in that hypothetical, attempting to hold a third party accountable for something they're not actually doing. Try to follow the ball instead of lecturing me to relax ;)
Yeah, otherwise it’d weird the new CEO had such a precise idea of the amount of money it could bring in. It makes it sound like Mozilla definitely had either considered offers from advertisers or done the maths themselves to work out potential revenue.
And for the record, as a Firefox user, count me in with the others who would switch and just use Safari on my Mac if they went through with it!