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The Telemetry feature sends us performance and usage data to help measure how Firefox behaves in the real world and improve it. Learn more.

It's helpful for Mozilla engineers to be able to measure how Firefox behaves in the real world. As you use Firefox, the [https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/index.html Telemetry] feature sends technical and interaction data to Mozilla on a daily basis. To learn more about what data Mozilla receives and how it's used, see Mozilla's [https://www.mozilla.org/privacy/firefox/#telemetry Firefox Privacy Notice]. =How do I opt-in or opt-out of sending performance data?= Firefox collects technical and usage data by default but you can turn this off at any time. #[[T:optionspreferences]] #Select the {menu Privacy & Security} panel. #Scroll down to the ''Firefox Data Collection and Use'' section. #Check or uncheck the box next to '''Allow Firefox to send technical and interaction data to Mozilla'''. ;[[Image:Fx68settings-DataCollection]] =Telemetry Data= To view the information about performance, hardware, usage and customization data collected by Telemetry, enter '''about:telemetry''' in the address bar. A Telemetry Data report will open. ;[[Image:Fx59AboutTelemetry]] To learn more about telemetry and Firefox data collection, see the [[Telemetry collection and deletion]] article.