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It's helpful for Mozilla's engineers and decision-makers to be able to measure how Firefox behaves in the real world. The Telemetry feature provides this capability by sending performance and usage info to Mozilla. As you use Firefox, Telemetry measures and collects non-personal information, such as performance, hardware, usage and customizations. It then sends this information to Mozilla on a daily basis and we use it to improve Firefox.

Accessing the Data

  • Instance Telemetry data (collected in your browser) can be viewed by typing about:telemetry into the Firefox URL bar.
  • Aggregate Telemetry data from all submissions can be viewed on the Telemetry dashboard at
  • Arbitrary custom analyses can be done via
  • Different datasets are available for SQL queries in our re:dash instance.


For Firefox Devs

Telemetry talks:

Telemetry client-side:

Telemetry back-end:

Telemetry Aggregates:

Analyzing Telemetry:

Telemetry status:

For Firefox Users

Filing Bugs

Telemetry client (in product) bugs should be filed in Toolkit::Telemetry.

Data Pipeline related bugs should be filed in one of the components in Data Platform and Tools

Telemetry dashboard bugs should be filed in Webtools::Telemetry Dashboard

Tracking Bugs

Open Telemetry bugs are usually organized as a blocker for one of the following tracking bugs:


Communication Type Mechanism Audience
Asking questions #telemetry on devs
General discussion dev-platform and fx-data-dev list devs
Announcements dev-platform, dev-planning lists all