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Add-ons let you personalize your browsing experience in Firefox so you can make it your own. Your participation supports user freedom by ensuring that it remains the most customizable browser available.

Connect with us

Subscribe to the Mailing List

  • Dev-addons: Public mailing list for development of the add-on ecosystem including the site and server extensions.

General Discussion Forums

  • Add-ons Forum: Discussions about add-on development, add-on support and

Latest News

Contact us

Public Meetings

See a list of all public add-on meetings.

Contribute to the Add-ons Ecosystem

Whether you're technical or not at all, there's a contribution opportunity for you. It's easy to get started, and your efforts help to make Firefox better!

Test Pilot

Try out experimental Firefox features by installing an add-on and tell us how you like them!

  • If you find bugs, file an issue at GitHub. If you got the coding skills and you're up for a challenge, help us fix the bugs!
  • More about the Test Pilot project

Create an Add-on

Add-ons for Firefox Desktop

To get started, check out this comprehensive tutorial. It contains documentation, tools and information on how to get in touch with other developers. Need suggestions on what to build? Here is a list of add-ons people have asked for.

Add-ons for Firefox for Android

Firefox for Android supports add-ons using the same extension system used by all other Gecko-based applications. Get started here.

Port Add-ons to Firefox

It's easy to port Chrome extensions to Firefox. Read this quick guide and happy porting!

Improve add-ons in Firefox

Contribute to the Add-on Manager in Firefox

The add-on manager is an integral part of the end-user's experience with

  1. Familiarize yourself with the on-boarding materials: Onboard to Firefox codebase
  2. Pick a "Good First Bug" to work on
Develop WebExtensions APIs

WebExtensions are the standard for add-on development in Firefox. It seeks to unify the extension APIs and architecture with those of other browsers in the name of interoperability and modern architecture.

  • If you're experienced with Mozilla infrastructure and would like to develop WebExtensions APIs directly for Firefox, here is a list of approved APIs that you can start contributing to.
  • If you'd like to become familiar with Mozilla infrastructure so you can develop WebExtensions APIs directly for Firefox, follow these steps:

Improve (AMO), commonly known as "AMO," is Mozilla's official site for developers to list add-ons, and for users to discover them.

Contribute code to AMO server

If you're new to Mozilla, and you know Python, get onboarded here and work on a "Good First Bug"!

Contribute code to AMO front-end

If you're interested in JavaScript and front-end technologies such as React and Redux, take a look at "Good First Bugs" in the front-end repository.

Become an Add-on Reviewer

Volunteer reviewers ensure the security and reliability of add-ons on AMO by testing every submission. Learn how you can join this community.

Rate your favorite add-ons

Search for your favorite add-on at 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.

Create a theme

Lightweight themes let you personalize the look of your Firefox. To create your own, start here.

Join the Featured Add-ons Advisory Board

The Featured Add-ons Advisory Board is comprised of a small group of community members who help select each month's featured add-ons. Every board serves for six months, then a new group of community curators take over. Check the Add-ons Blog to learn when the next application period opens and for application instructions.

Curate Featured Themes collection

Help us curate Mozilla's Featured Themes collection to help users find high-quality themes. Learn more and apply to be a curator.

Test add-ons

Contribute to add-on developer tools

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:

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).


  • 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.
  • Localize - Join Pontoon and translate frontend or backend to your Language.

Contributor Recognition

Report Your Contributions

We want to make sure you're recognized for your contributions!

  1. Create a Mozillians profile if you haven't already.
  2. Add your name and accomplishments on the Recognition wiki page (please be specific--these will be archived by month, so list your recent contributions).

We regularly choose an outstanding contributor (Friend of Add-ons) and send that person a token of appreciation. Any contribution is eligible--it doesn't have to be an opportunity listed on this page!

Friends of Add-ons

Big thanks to these outstanding volunteer contributors!