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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's engineers to be able to measure how Firefox behaves in the real world. As you use Firefox, we receive on a daily basis technical and interaction data. {for not fx56}Telemetry is an opt-in feature. This means that you specifically need to tell Firefox to collect and send this information to Mozilla.{/for} For more about what data we receive and how it's used, see Mozilla's [https://www.mozilla.org/en-US/privacy/firefox/#telemetry Firefox Browser Privacy Notice.] =How do I opt-in or opt-out of sending performance data?= You can turn this on and off at any time with these steps: {for not fx56} #[[T:optionspreferences]] #Select the {menu Advanced} panel. #Select the {menu Data Choices} tab. #Check or uncheck the box next to '''Share additional data (i.e., Telemetry)'''. ;{for not fx51}[[Image:telemetry 38 thecorrect1]]{/for}{for fx51}[[Image:Fx51DataChoices-Telemetry]]{/for} {/for} {for fx56} #[[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 {for not fx57}automatically {/for}send technical and interaction data to Mozilla'''. ;{for =fx56}[[Image:Fx56Privacy&Security-DataCollection]]{/for}{for fx57}[[Image:Fx57Privacy&Security-DataCollection]]{/for} {note}'''Note:''' Mozilla has made changes to data collection and sharing preferences in [[Find what version of Firefox you are using|Firefox version]] 56 and above. For more information, see [https://blog.mozilla.org/futurereleases/2017/09/06/data-just-living/ this Mozilla blog post].{/note} {/for} {for fx59} =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]] {/for}