I originally signed up for Test Pilot, thinking Mozilla would respect my privacy.
But then I discovered that not only must I leave telemetry on in order to use it, I have to use a 3rd-party app for 2-factor authentication, AND it makes use of Google Analytics.
Which means there are AT LEAST 2 different 3rd parties tracking my actions when I do anything significant with Test Pilot.
Unsubscribing and deleting it now.