Let's assume FireFox REALLY sends out problems it found in a crashed system... What else does it send out?
I will not allow anything - as long as I can control it either during the installation process or with a third party software - to out of my system.
It is very nice that FireFox is free, and without a doubt, it is the best browser out there right now.... still, privacy is number one.
All the best.
PCBWizz