Thunderbird Privacy Notice by Mozilla

Updated 16 December 2025

The Thunderbird Privacy Notice explains how data is collected, processed, and shared across Thunderbird desktop and mobile applications to support email, calendar, add-ons, updates, and security features while keeping message content and core personal data stored locally on the user’s device. It is issued by MZLA Technologies Corporation, a Mozilla subsidiary, and aligns with Mozilla’s broader privacy framework, making it suitable for assessing privacy practices in open-source, user-controlled communication software.

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