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One item in the release notes of Firefox 7 reads

Added an opt-in system for users to send performance data back to Mozilla to improve future versions of Firefox

This is feature is also called telemetry. How can I enable it?

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up vote 4 down vote accepted
  1. Enter the Preferences of Firefox.
  2. Go to Advanced.
  3. Check "Submit performance data" under General - System Defaults.

How to submit performance data in Firefox

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