"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. "
org.mozilla.telemetry | org.mozilla.gecko.telemetry | mozilla.telemetry.glean. | org.mozilla.fenix.GleanMetrics | org.mozilla.fenix.components.metrics
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