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The Telemetry feature sends performance and usage data to us so we can measure how Firefox behaves in the real world and improve it. Learn how to turn this on.

It's helpful for Mozilla's engineers 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 us. As you use Firefox, Telemetry measures and collects non-personal information, such as memory consumption, responsiveness timing and feature usage. It then sends this information to Mozilla on a daily basis and we use it to make Firefox better for you. Telemetry is an opt-in feature. This means that you specifically need to tell Firefox to collect and send this information to us. For more about what kind of information is collected and how it's used, see our [http://www.mozilla.org/legal/privacy/firefox.html#telemetry privacy policy]. =How do I opt-in or opt-out of sending performance data?= {for not fx20} When you install or update Firefox you may be presented with the following message that lets you turn the Telemetry feature on: {for mac}"Will you help improve Mozilla Firefox by sending information about performance, hardware, usage, and customizations to Mozilla?"{/for} :{for win}[[Image:Telemetry prompt - win]]{/for} :{for linux}[[Image:Telemetry prompt - lin]]{/for} You can also turn this on and off at any time with these steps: #[[T:optionspreferences]] #Select the {menu Advanced} panel. #Select the {menu General} tab. #Check or uncheck the box next to '''Submit performance data'''. #:{for win}[[Image:Telemetry - win]]{/for} #:{for linux}[[Image:Telemetry - lin]]{/for} #[[T:closeoptionspreferences]] {/for} {for =fx20,=fx21,=fx22,=fx23,=fx24,=fx25,=fx26,=fx27,=fx28,=fx29,=fx30,=fx31,=fx32,=fx33,=fx34,=fx35,=fx36,=fx37} You can turn this on and off at any time with these steps: #[[T:optionspreferences]] #Select the {menu Advanced} panel. #Select the {menu Data Choices} tab. #Check or uncheck the box next to '''Enable Telemetry'''. #;{for winxp}[[Image:fx20 options - advanced - data choices]]{/for}{for win7,win8}[[Image:Enable Telemetry - Win7]]{/for} #[[T:closeoptionspreferences]] {/for} {for fx38} You can turn this on and off at any time with these steps: #[[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)'''. [[Image:telemetry 38 thecorrect1]] {/for}