Earlier quoted context omitted.
Are we sure about this? I mean I mostly agree that telemetry is different, but how can we be sure Mozilla isn't sharing their telemetry information with ad networks to help fingerprint you? It seems the only way to be truly sure is if we could verify the browser sent no information at all, right? Or else it's just about trust, same as any other browser.
It's mostly about trust, but we have more reasons to trust Mozilla than other browser vendors - they consist of a community of people who care about their values, they've staked their reputation on those values, they are transparent, they're a legal non-profit, etc. Their financial statements are also public, and I don't think any income from ad networks has been found there.
I think Cliqz incident and Shield Studies AR Game incident prove that you can trust Mozilla as much as any other huge corp.