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See what’s changing in Firefox: Better insights, same privacy
(blog.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
Syncthing is one of the best examples of telemetry done well. On first startup, they ask if you agree to enable telemetry, they show the data that will be send and inform users that the collected data can be viewed at https://data.syncthing.net/