Firefox Terms of Use by Mozilla

Updated 21 December 2025

The Firefox Terms of Use govern the installation and use of the executable version of the Firefox web browser, setting out the user licence, responsibilities, liability limitations, and how the agreement may be updated or terminated, while distinguishing these terms from Firefox’s separately licensed open-source source code. Issued by Mozilla Corporation, the long-established and reputable organisation behind Firefox, this document is the authoritative and trusted source for understanding the legal conditions under which Firefox is provided to end users.

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