How is this any different from a standard Firefox install with telemetry turned off
I know you can turn this stuff on manually but it's convenient to have a fork that does it for you and turns off Mozilla's telemetry completely
For what it's worth, some of the startup checks are to see whether the user is on a public wifi with a captive portal, and talk to a Mozilla service rather than Google. Other checks are for upgrades, or Firefox Sync, if enabled.