Firefox Focus and Klar Terms of Use by Mozilla
Updated 9 December 2025
This document outlines the Terms of Use for the Firefox Focus and Klar web browser software. It details the rights and permissions granted by Mozilla to the user, the open-source nature of the software, and important limitations on Mozilla's liability. The terms also cover user responsibilities and how the agreement can be updated or terminated.
Firefox Focus and Klar Terms of Use
Effective April 22, 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 Focus and Klar 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 Focus and Klar Privacy Notice. It also includes a non-exclusive, royalty-free, worldwide license for the purpose of doing as you request with the content you input in Firefox. This does not give Mozilla any ownership in that content.
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.
Termination
These Terms apply until either you or Mozilla decide to end them. You can choose to end them at any time for any reason by stopping your use of Firefox. Mozilla can suspend or end anyone’s access to Firefox at any time for any reason, including if Mozilla decides not to offer Firefox anymore. If we decide to suspend or end your access, we will try to notify you at the email address associated with your account or the next time you attempt to access your account.
You Are Responsible for the Consequences of Your Use of Firefox
You agree that you will not use Firefox to infringe anyone’s rights or violate any applicable laws or regulations.
You will not do anything that interferes with or disrupts Mozilla’s services or products (or the servers and networks which are connected to Mozilla’s services).
You Won’t Claim Mozilla is Responsible for Your Use of Firefox (Indemnification)
You agree to indemnify and hold Mozilla and its affiliates harmless for any liability or claim from your use of Firefox, to the extent permitted by applicable law.
There are Some Important Limitations on Mozilla’s Liability
To the extent permitted by applicable law, you agree that Mozilla will not be liable in any way for any inability to use Firefox or for any limitations of Firefox. Mozilla specifically disclaims the following: Indirect, special, incidental, consequential, or exemplary damages, direct or indirect damages for loss of goodwill, business interruption, lost profits, loss of data, or computer malfunction. Any liability for Mozilla under this agreement is limited to $500.
You may have other rights under your own country’s laws. Nothing in these Terms is intended to affect those rights, if they apply.
Firefox is Provided “As is” (Warranty Disclaimer)
Mozilla provides Firefox “as is.” To the extent applicable law allows, Mozilla and its affiliates specifically disclaim any legal guarantees or warranties such as “merchantability,” “fitness for a particular purpose,” “non-infringement,” and warranties arising out of a course of dealing, usage, or trade.
Other Things You Should Know
Choice of Law
California law applies to this contract, except for California’s conflict of law.
If there is any conflict between this English version of these Terms and a translation, this English version applies.
You can contact Mozilla at:
Mozilla Corporation
Attn: Mozilla – Legal Notices
149 New Montgomery Street
4th Floor
San Francisco, CA 94105
About this template
What is this template?
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