> Mozilla notes that the opt-out mechanism is the standard Telemetry opt-out. How users may opt-out before the installation of Firefox is unclear. A quick check of Chrome installers returned identical hashes each time.

This is why I keep insisting that we need a browser made in a jurisdiction which has at least minimal privacy rights. Having to explicitly opt-out of being tracked by a browser is not reasonable at all; browsers should only spy/track users who explicitly consent, not by default.