Firefox put a lot of effort into tracking download to install behavior. Maybe this is the only violation you know about. There's no reason to continue to believe in Mozilla's good faith. They've been captured, and are 90% dependent on Google revenue.
Discussion here: https://news.ycombinator.com/item?id=28954390
Firefox is dead. It's time to move past denial. It doesn't stand for anything you think it does. I'm sad, too. Time to bury the putrid, rotting corpse.