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addons.mozilla.org, commonly known as "AMO", is Mozilla's official site for add-ons. Add-ons let you personalize your browsing experience on Firefox so you can make it your own. Contribute to user freedom by keeping Firefox the most customizable browser available.

Connect with us

Mailing List

Join the marketplace-contributors mailing list to be kept in the loop about contribution opportunities and events.

Discussion Forums

Mozilla Guides

Are you brand-new to Mozilla and need encouragement, coaching, and mentors to take your first steps and find the projects you want to make an impact on? Mozilla Guides is a searchable, organized resource for you.

Latest News

The Add-ons Blog

Public Meetings and Open Chat

Marketplace Community Meeting

AMMO Team Open Chat

See a list of all public Marketplace meetings: https://wiki.mozilla.org/Marketplace#Meetings_Open_for_All

Contact us

Contribute to Add-ons (AMO)

Thank you for your interest in Add-ons. Whether you're technical or not at all, there's a contribution opportunity for you. It's easy to get started, and your efforts are appreciated!

For all levels of technical ability:

Review your favorite add-ons

Search for your favorite add-on at https://addons.mozilla.org. On the add-on's detail page, scroll down to the Reviews section and leave a comment for the developer.

Create a collection

Collections make it easy to keep track of favorite add-ons and share your perfectly customized browser with others. Get started here: https://addons.mozilla.org/firefox/collections/

Create a theme

Lightweight themes let you personalize the look of your Firefox. To create your own, start here: https://addons.mozilla.org/developers/docs/themes


  • MDN's "localization priorities" list - We're always in need of translators--here are the priority projects for add-ons.
  • Localize an add-on - Join the Babelzilla community and help translate add-ons to your language. Get started here: http://babelzilla.org/

For more technical contributors:

Create an add-on

To get started, take a look at the Add-on Developer Hub. It contains documentation, tools and information on how to get in touch with other developers.

Or, check out a comprehensive tutorial for more advanced developers.

You can post questions and connect with other add-ons developers in the Add-ons Forum.

Review add-ons

Volunteer reviewers ensure the security and reliability of add-ons on AMO by testing every submission. Learn how you can join this community: https://wiki.mozilla.org/Marketplace/Reviewers/Addons

Test add-ons

To help test addons.mozilla.org (AMO), please take a look at this list of tests: https://oneanddone.mozilla.org/tasks/11/

To help test specific add-ons, please follow these instructions: https://oneanddone.mozilla.org/tasks/56/

It's also helpful to install the Add-ons Compatibility Reporter and use it to let us know when an add-on is not working properly.

Help add-on users

Answer questions from add-on users in the Firefox Support Forum!

Help add-on developers

If you're already familiar with add-on development or you think you're a good technical writer, help us improve the documentation for add-on developers: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons

You can also help by translating these docs to a different language (pro tip: try replacing the en-US part of the link above to your native language code).