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Firefox Add-on Distribution Agreement

Effective December 1, 2021

1. Introduction

Mozilla is committed to promoting choice and innovation on the web. From the launch of Firefox, we’ve allowed anyone to create and distribute Firefox Add-ons.

This Firefox Add-on Distribution Agreement ("Agreement") governs Your distribution of Firefox Add-ons. Frequently used terms in this Agreement are defined below.

  • “Add-on” means software that extends the functionality of Firefox, for example, extensions, themes (defined below), search providers, dictionaries, and language packs. Add-ons are also commonly referred to as extensions or plugins.
  • “Add-on Manager” is the Firefox tool to manage Add-ons. It can be accessed from the Firefox menu button in the toolbar.
  • “AMO” means addons.mozilla.org, which is our online platform for developers to list and distribute Add-ons to End-Users.
  • “Theme” means software that personalizes the look of Firefox by adding a design. Themes are a type of Add-on.
  • “Brand Features” mean the trade names, trademarks, service marks, logos, domain names, and other distinctive brand features of You or Mozilla.
  • “End-Users” mean individuals who install Add-ons, or to whom Add-ons are promoted.
  • “Firefox” means the awesome web browser developed by Mozilla.
  • “Listed Add-on” means Add-ons that are listed and distributed on AMO.
  • “Mozilla” means Mozilla Corporation, its affiliated entities, and designated community members who are part of the Add-on review process.
  • “Mozilla Certificate” means a Mozilla issued certificate to digitally sign an Add-on for use with Firefox.
  • “Signed Add-on” means an Add-on that has been issued a Mozilla Certificate.
  • “Self-distributed Add-on” means Add-ons that are distributed to End-Users via means other than AMO.
  • “You” means the person or entity entering this Agreement for the purpose of distributing a Firefox Add-on.

2. Accounts

In order to distribute an Add-on, You'll need to create a Mozilla account. During registration, You will be asked to set a password. You are responsible for keeping Your password confidential and for the activity that happens through Your account. Mozilla is not responsible for any losses arising out of unauthorized use of Your account.

We may require you to disclose all Accounts and Add-ons that You own or control. You agree that you will disclose all Accounts and Add-ons that You own or control if we request this information.

4. Distribution, certificates, & review process

(a) Distribution Options

  • Listed Add-ons: You can request Your Add-on to be listed and distributed on AMO. AMO is a popular site with billions of Add-on downloads. End-Users can search titles, navigate categories, or view promoted, featured, popular, or top rated Add-ons. End-Users can also rate Add-ons and leave comments.
  • Self-distributed Add-ons: Add-ons that are distributed by a website or method outside of AMO. Common examples are Add-ons that are distributed from the developer website, when an Add-on isn’t intended for the public or is bundled with another Add-on. For example, some Add-ons are created by a company for employees; created for research purposes by a limited group; or are in development or testing phase and not yet suitable for a general audience.

(b) Mozilla Certificates

All Add-ons must be signed using a Mozilla Certificate, which is a digital signature that enables the Add-on to be used with Firefox. Mozilla Certificates are incorporated by Mozilla into Your Add-on (this process is also referred to as “signing an Add-on”).

Signed Listed Add-ons are automatically distributed by Mozilla on AMO. Links to Signed Self-distributed Add-ons will be provided to You for distribution.

(c) Review Process

All Add-ons, regardless of type or distribution channel, must meet certain review criteria, which are described in our Review Policies. Mozilla may at any time monitor, test or review Listed and Self-distributed Add-ons for compliance with this Agreement and the Review Policies. The inclusion of an Add-on on AMO or issuance of a Mozilla Certificate is at Mozilla’s sole discretion.

5. Your obligations

You represent and warrant that:

(a) Relationship with Mozilla. You will provide accurate information and updates to Mozilla during registration and any communications with Mozilla in connection with Your Add-ons. The descriptions and other data You provide about the Add-on are true to the best of Your knowledge. Unless You and Mozilla have a written agreement stating otherwise, Your Add-on will not imply in any way that it is produced, sponsored or endorsed by Mozilla.

(b) Relationship with End-Users. As between You and Mozilla, You are solely responsible for Your Add-ons and the relationship between You and Your End-Users. You will provide accurate information and updates to Your End-Users about Your Add-ons, including disclosure of all security permissions and End-User data necessary for the Add-on to function. You are solely responsible for providing reasonable technical support to End-Users and You will make appropriate support contact information available.

(c) Intellectual Property Rights. You have and will maintain all necessary copyright, trademark, patent or other proprietary or legal rights to post, display, perform, use, reproduce, distribute and transmit Your Add-on, worldwide, as well as the rights to authorize others (including Mozilla) to do the same.

(d) Export Restrictions. Your distribution of Add-ons may be subject to United States export laws and regulations. You will comply with all domestic and international export laws and regulations that apply to Your distribution of Add-ons. These laws include restrictions on destinations, users and end use.

6. Licenses; proprietary rights

Mozilla encourages You to make Your Add-ons available under open source licenses such as the MPL for source code and a Creative Commons license for creative works.

You hereby grant to Mozilla a non-exclusive, worldwide, royalty-free, sublicensable license under all of Your rights necessary to review Your Add-ons (including the source code, if required); create Signed Add-ons; and publish, distribute, and promote Listed Add-ons as part of AMO or related Mozilla promotional efforts.

Between Mozilla and You, each party shall own all right, title and interest, including without limitation all intellectual property rights, relating to its Brand Features. Mozilla does not grant You any intellectual property rights not specifically stated in this Agreement. For example, this Agreement does not provide You the right to use any of Mozilla’s Brand Features. Firefox and AMO are distributed under and subject to the current version of the Mozilla Public License, or other similarly permissive licenses.

7. Content removal

(a) Removal from Distribution by You.
You may cease distribution of Your Add-ons at any time by removing your Add-on from AMO. You agree that ceasing maintenance or distribution of Add-ons does not necessarily remove Your Add-on from End-User machines, hardware, or other devices, or from any part of AMO where Add-ons are stored on behalf of End-Users (if any).

(b) Removal from Distribution by Mozilla.
Mozilla reserves the right (though not the obligation) to, in our sole discretion, remove or revoke access to any Listed or Self-distributed Add-ons as well as AMO accounts. This applies, but is not limited to, Add-ons and AMO accounts that, in our reasonable opinion, violate this Agreement or the law, any applicable Mozilla policy, or is in any way harmful or objectionable. In addition, we may at any time remove Your Add-on from AMO; blocklist an Add-on; delete your AMO account; flag, filter, modify related materials (including but not limited to descriptions, screenshots, or metadata); reclassify the Add-on; or take other corrective action.

For example, a Listed Add-on or AMO account may be removed in response to abuse reports from End-Users, in response to a Take-Down Request, or if it comes to Mozilla’s attention that the Add-on or AMO account violates our Conditions of Use. An Self-distributed Add-on may be blocklisted or the Mozilla Certificate revoked if it comes to Mozilla’s attention that it violates the Security Criteria described in our Review Policies.

This includes a policy to terminate and ban developers we consider to be repeat infringers. If we determine that You have repeatedly violated this Agreement or the Review Policies, we may terminate Your AMO account and its Add-ons as well as any other AMO accounts and Add-ons you own or control. This includes the removal, revocation, and/or corrective action described above. We may also prohibit You from creating any new AMO accounts or Add-ons.

In addition, we may at any time suspend or terminate this Agreement with You if we are no longer going to support the products and services related to Firefox Add-ons or issue Mozilla Certificates.

(c) Take Down Request.

For information on how to notify Mozilla in connection with claimed copyright or trademark infringement (“Take-Down Request”) see here.

8. Disclaimer of warranties

AMO, MOZILLA CERTIFICATES, AND MOZILLA PRODUCTS AND SERVICES ARE PROVIDED “AS IS”. MOZILLA, ITS CONTRIBUTORS & LICENSORS, DISCLAIM ALL WARRANTIES, WHETHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF IMPLIED WARRANTIES, SO THIS DISCLAIMER MAY NOT APPLY TO YOU.

9. Limitation of liability

YOU EXPRESSLY UNDERSTAND AND AGREE THAT, EXCEPT AS REQUIRED BY LAW, MOZILLA, ITS CONTRIBUTORS & LICENSORS, WILL NOT BE LIABLE TO YOU UNDER ANY THEORY OF LIABILITY FOR ANY INDIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR EXEMPLARY DAMAGES THAT MAY BE INCURRED BY YOU, INCLUDING ANY LOSS OF DATA, WHETHER OR NOT MOZILLA OR ITS AGENTS HAVE BEEN ADVISED OF OR SHOULD HAVE BEEN AWARE OF THE POSSIBILITY OF ANY SUCH LOSSES ARISING. IN NO EVENT SHALL MOZILLA’S AGGREGATE LIABILITY TO YOU FOR ANY DAMAGES ARISING FROM OR RELATED TO THESE TERMS BE IN EXCESS OF THE GREATER OF (i) $100 OR (ii) THE TOTAL AMOUNTS PAID TO YOU BY MOZILLA IN THE TWELVE MONTHS IMMEDIATELY PRECEDING THE INITIAL NOTICE OF ANY CLAIM. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF CERTAIN TYPES OF LIABILITY, SO THIS DISCLAIMER MAY NOT APPLY TO YOU.

10. Release; indemnification

You release Mozilla, its officers, employees, agents and successors from claims, demands and damages of every kind or nature arising out of or related to any disputes with End-Users, including other Add-on developers.

If any third party brings a claim against Mozilla related to Your use of AMO or Your Add-ons, You will defend and hold Mozilla harmless from and against all damages, losses, and expenses of any kind (including reasonable legal fees and costs) related to such claim.