Firefox Focus and Klar Terms of Use by Mozilla

Updated 16 December 2025

The Firefox Focus and Klar Terms of Use set out the rights, permissions, and responsibilities for using Mozilla’s open source Firefox browser, including licensing, intellectual property, optional services, liability limits, and termination. They are issued directly by Mozilla Corporation, clearly linked to the applicable privacy notices and open source licences, and written to define how the software may be used across jurisdictions.

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