I trust Mozilla has done the diligence to handle the data correctly. If I didn't trust Mozilla I wouldn't use Nightly or even Firefox. I use Nightly because I w

I trust Mozilla has done the diligence to handle the data correctly. If I didn't trust Mozilla I wouldn't use Nightly or even Firefox. I use Nightly because I want to help Mozilla test and make Firefox better. For me that includes opting-in to studies, reporting bugs, and helping test about:config flags they mention in their Nightly blog.