Unless explicitly disabled, mozregression will send a telemetry “ping” (a small JSON-document) to Mozilla’s servers on each use (command-line invocation in the case of console mozregression, each bisection or single run in the case of the GUI).
This ping does not contain any personally identifiable information and is intentionally limited to what we need to understand the basics of how mozregression is being used (for example, understanding which applications are being bisected). For an up-to-date list of what is being collected, please see mozregression in the Glean Dictionary.
How to disable
We encourage you to leave Telemetry enabled – if we know that people
are getting value out of mozregression, it provides an incentive to
make it better! That said, disabling mozregression is easy. In the
command-line variant, you can set
enable-telemetry to no inside your configuration file. In the GUI version, simply untick the box “Enable Telemetry” in the preferences dialog (after clicking “Show Advanced Options”).