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The Mozilla Foundation works to ensure the internet remains a public resource that is open and accessible to us all.

Source Code

All Mozilla software is open source and free software. This means that it is not only available for download free of charge, but you have access to the source code and may modify and redistribute our software subject to certain restrictions.

For more details, please read about our source code license and software licensing policy.


Although our code is free, it is very important that we strictly enforce our trademark rights, in order to be able to protect our users against people who use the marks to commit fraud. This means that, while you have considerable freedom to redistribute and modify our software, there are tight restrictions on your ability to use the Mozilla names and logos in ways which fall in the domain of trademark law, even when built into binaries that we provide.

For more detail on our trademark licensing, see our Mozilla Trademark Guidelines. If you still have questions after reading the policy, please contact [email protected].

Website Content

The text of Mozilla websites is generally licensed under a Creative Commons Attribution (CC BY) or Attribution-ShareAlike (CC BY-SA) license, as indicated. For more details, see our website licensing page.

Website Code

You may use the HTML and CSS files on www.mozilla.org or other mozilla.org websites for your web site - as long as you don't use the visual design or style (the colors, gradients, fonts, etc.). In other words, you can use the HTML and/or CSS code, but your page should not look like you took Mozilla's page and dropped in your logo. This does not grant you any right to use the trademarks, trade names, service marks, or trade dress of the Mozilla Foundation.

Executable Software

Executable software binaries released by the Mozilla Project, such as Firefox and Thunderbird, are made available under the terms of the MPL. On some proprietary, non-free platforms, necessary binary components subject to other licenses may be included in the installer, as explained in this policy.

Informative, Not Authoritative

This page is designed to inform, not to be the final, authoritative reference. If you're looking to reuse or redistribute something Mozilla has created, always check the licensing in the thing itself (for example, in the footer of a web page, or in the "About" box of software) after you've looked at this document.

In case of a conflict between this document and other documents (for example, if this document and the header file of a particular source code file conflict) the other document should take precedence. If you do discover such a conflict, please notify [email protected] so we can fix it.


If, after reading all the above carefully, you have a further question about the licensing terms of anything created by the Mozilla project, please send the question to [email protected].