Where can I disable "Send performance data to Mozilla" or check if it is enabled?

A few hours after upgrading to Firefox 20, a bar was shown at the bottom of the window telling me that some data was being sent to Mozilla. the bar had a button labeled "Select which info" (or similar, I don't have a screenshot). Pushing the button did not more than opening the Options root page (the one with the row of icons at the top), and hided the bar.

Mozilla's help about that option ( is outdated: it shows the old Options dialog, and refers to a checkbox that doesn't exist anymore in Firefox 20.

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