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.
- 1 Connect with us
- 2 Public Meetings
- 3 Contribute to the Add-ons Ecosystem
- 3.1 Test Pilot
- 3.2 Create an Add-on
- 3.3 Improve add-ons in Firefox
- 3.4 Improve addons.mozilla.org (AMO)
- 3.5 Help add-on users
- 3.6 Help add-on developers
- 3.7 Localization
- 4 Contributor Recognition
Connect with us
Subscribe to the Mailing List
- Dev-addons: Public mailing list for development of the add-on ecosystem including the site addons.mozilla.org and server extensions.
General Discussion Forums
- Add-ons Forum: Discussions about add-on development, add-on support and addons.mozilla.org.
- Community Team
- IRC: irc.mozilla.org, #amo, #addons, #extdev, #amo-editors channels
- Facebook: mozaddons
- Twitter: @mozamo
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!
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.
Improve add-ons in Firefox
WebExtensions is becoming 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.
Develop WebExtensions APIs
- 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:
- If you just want to tinker with WebExtensions APIs without having to build Firefox, WebExtensions Experiments is for you!
Improve addons.mozilla.org (AMO)
Addons.mozilla.org, 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
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 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.
Create a theme
Lightweight themes let you personalize the look of your Firefox. To create your own, start here.
- NEW! Run an Activate campaign for testing featured add-ons for multiprocess Firefox compatibility
- Do you know Python? Help write automated tests for AMO!
- To help test addons.mozilla.org (AMO), please take a look at this list of tests.
- 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. The latest version gives you an easy way to report multiprocess Firefox compatibility.
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/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).
- 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 addons.mozilla.org - Join Pontoon and translate addons.mozilla.org to your Language.
Report Your Contributions
We want to make sure you're recognized for your contributions!
- Create a Mozillians profile if you haven't already.
- 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!