Mozilla will stop transmitting telemetry data to the Leanplum service in Firefox for Android and iOS.
Mozilla has decided not to renew its contract with the marketing company Leanplum, under which telemetry was sent in the mobile versions of Firefox for Android and iOS. By default, telemetry sending to Leanplum was enabled for approximately 10% of users in the U.S. Information about the telemetry sending was displayed in the settings and was available to disable (in the 'Data collection' menu).
