Mozilla [is] asking for user data in order to operate Firefox
I'm confused. Isn't Firefox an autonomous application? Like it could be "programmed" to do stuff without asking Mozilla every time? Why am I not operating Firefox, why is it Mozilla?
Some people don't care about that stuff, and it's their right to be as private (or not) as they choose. They can't make informed decisions, however, if companies don't tell them what they're doing with user data.