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Metrics we collect
By default, the about:newtab, about:welcome and about:home pages in IceCat (the pages you see when you open a new tab and when you start the browser), will send data back to GNU servers about usage of these pages. The intent is to collect data in order to improve the user's experience while using Activity Stream. Data about your specific browsing behaior or the sites you visit is never transmitted to any GNU server. At any time, it is easy to turn off this data collection by opting out of IceCat telemetry.
Data is sent to our servers in the form of discrete HTTPS 'pings' or messages whenever you do some action on the Activity Stream about:home, about:newtab or about:welcome pages. We try to minimize the amount and frequency of pings by batching them together.
At Mozilla, we take your privacy very seriously. The Activity Stream page will never send any data that could personally identify you. We do not transmit what you are browsing, searches you perform or any private settings. Activity Stream does not set or send cookies, and uses Transport Layer Security to securely transmit data to GNU servers.
The data collected in the Activity Stream is documented (along with the other data collected in IceCat Desktop) in the Glean Dictionary.
Ping specifically collected on IceCat Home (New Tab) include: