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As a rule, Firefox already collects very little of your data. In fact, most of what we receive is to help us improve the performance and security of Firefox. We call this telemetry data. This telemetry doesn’t tell us about the websites you visit or searches you do; we just know general information, like a Firefox user had a certain amount of tabs opened and how long their session was. We don’t collect telemetry in private browsing mode and we’ve always given people easy options to disable telemetry in Firefox. And because we’ve long believed that data should not be stored forever, we have strict limits on how long we keep telemetry data.
We’ve decided to go the extra mile and expand user deletion rights to include deleting this telemetry data stored in our systems. To date, the industry has not typically considered telemetry data “personal data” because it isn’t identifiable to a specific person, but we feel strongly that taking this step is the right one for people and the ecosystem.