[tomp]

People trust Mozilla because someone could read the code (and probably, many people do).

[seabee]

People trust Apple and nobody else can read their code. This suggests open source is not necessary to build trust.

[xyproto]

No, people choose comfort and projecting an image of status over privacy. It's not because they trust Apple.

[drdaeman]

I'm afraid Firefox is so abysmal noone could comprehend the whole project's code. Guess, we could only review a tiny bits of it (I had briefly read sync-related parts of code in hope I could replace them with something saner and simpler, but ditched the idea) and hope others did the same for other parts.