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What "test information" does Nightly automatically send back to Mozilla?


When I looked in the "About Nightly" section, it says Nightly automatically sends "test information" back to help with improvements. What does this information consist of? Is any of it personally identifiable?

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IIRC it is anonymous, and similar but slightly less detailed info can be sent from the ordinary Releases, if you opt in. Additionally you may choose to submit crash info, and have an option of including a contact email address in that

This all started because firefox developers realised that hangs were being missed, and also some users would have slow startups. This allows a certain amount of realworld real user info to be collected.