Firefox Terms of Use by Mozilla
This document outlines the terms and conditions for using the Firefox web browser software. It details the rights granted by Mozilla to the user, the user's responsibilities, and important limitations on Mozilla's liability and warranties. It also covers aspects like intellectual property and how updates to these terms are handled.
Firefox Terms of Use
Effective June 10, 2025
Firefox is free and open source web browser software, built by a community of thousands from all over the world.
Please read these Terms of Use (“Terms”) carefully because they explain important information about using your copy of the Firefox software. These Terms are a binding agreement between Mozilla Corporation (“Mozilla”) and You. For details about Firefox privacy practices, please read the Firefox Privacy Notice.
Mozilla Gives You Certain Rights and Permissions
Mozilla grants you a personal, non-exclusive license to install and use the “Executable Code" version of the Firefox web browser, which is the ready-to-run version of Firefox from an authorized source that you can open and use right away.
Firefox is Open Source Software
We make the source code for Firefox available to you under the terms of various open source licenses, including the Mozilla Public License. This means you may use, copy, modify, and distribute Firefox to others, as long as you follow the open source licenses and the Mozilla Trademark Guidelines. These Terms only apply to the Executable Code version of Firefox, not the Firefox source code.
In order to play certain types of video, Firefox may download content decryption modules from third parties which may not be open source.
Mozilla’s Intellectual Property
Mozilla does not grant you any intellectual property rights in Firefox that are not specifically stated in these Terms. For example, these Terms do not give you rights to use any copyrights, trademarks, or other distinctive brand features of Mozilla or its licensors.
You Give Mozilla Certain Rights and Permissions
You give Mozilla the rights necessary to operate Firefox. This includes processing your data as we describe in the Firefox Privacy Notice.
Your Feedback and Suggestions
If you give Mozilla any ideas, suggestions, or feedback about the Services, you give Mozilla permission to use them for free and without any additional obligations.
If You Use Certain Optional Firefox Features or Services, There are Additional Terms
Some Services in Firefox Require a Mozilla Account
If you want to use certain services like sync, you’ll need a Mozilla account. To create a Mozilla account, you will also need to agree to the Terms of Service and Privacy Notice for Mozilla accounts.
Other Optional Services
Some features in Firefox require you to opt in to them specifically. In order to use them, you will need to agree to the specific Terms and Privacy Notice for each service you use.
Mozilla Can Update or Terminate This Agreement
Mozilla Can Update These Terms
Every once in a while, Mozilla may decide to update these Terms. We will post the updated Terms online. We will take your continued use of Firefox as acceptance of such changes. We will post an effective date at the top of this page to make it clear when we made our most recent update.
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