Performance/Telemetry

Telemetry allows developers to receive aggregate data of browser health in the field (docs).

The following statistics are currently gathered:

about:memory stats

• Memory:heap-used/js/gc-heap (KB)
• Memory:heap-used/layout/all (KB)
• Memory:mapped/heap/used (KB)
  

Latency stats:

• nsCycleCollector::Collect (ms) - Time spent on cycle collection
  

Telemetry self-diagnostics:

• telemetry.ping (ms) - Delay between submitting telemetry ping data and getting a response from server.
• telemetry.success (No, Yes) - Whether the past telemetry pings succeeded 1:No 2:Yes.