> Nothing personal or valuable leaves your computer. Maybe the location queries, but I expect they are anonymized.
You said "That data doesn't leave the user's computer". It does. You may not consider it personal or valuable and may trust Mozilla's anonymization to be sufficient, but well-written privacy laws rightly do not grant Mozilla (or anyone less trustworthy than Mozilla) that kind of wiggle room.
You are focused on some concept of perfect confidentiality, which is not how real engineering or confidentiality works.
I'm not interested in your personal comments. Keep them to yourself.