Tools -> Options -> Advanced -> Data Choices
you can untick the the options there.toolkit.telemetry.server
to 0.0.0.0, or some other non-existent IP. Also be sure to disable toolkit.telemetry.unified
, toolkit.telemetry.enabled
and toolkit.telemetry.archive.enabled
. When I say disable a setting, I mean set it to False.pingsender
and why does it wants to connect to incoming.telemetry.mozilla.org?