just found: http://www.theregister.co.uk/2012/02/07/mozilla_telemetry_controversy/
Mozilla coders are arguing among themselves about the open-source outfit's Metrics Data Ping project, which was designed to monitor Firefox usage metrics. Several coders in the Mozilla camp have expressed concern about how some developers are proposing the project should collect data from users of the browser.
what’s still safe ??? ;D
the conversation is there:
http://groups.google.com/group/mozilla.dev.planning/browse_thread/thread/eaae24bd14c0728c/dce1cad9a8c9e273?show_docid=dce1cad9a8c9e273&pli=1
technical infos here:
https://wiki.mozilla.org/MetricsDataPing
https://bugzilla.mozilla.org/show_bug.cgi?id=718066