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We love code contributions to the add-ons ecosystem! Below you'll find ways to contribute code, and information on the onboarding process. Onboarding helps ensure you are getting the most out of your experience working with other staff and volunteer developers. Once you're familiar with the dev environments, please pick a "Good First Bug" to get started.

Step 1: Create some accounts

Please create accounts on the following sites, if you haven't already:

Step 2: Tell us a little about yourself

Please fill out a short survey so we can better connect you to the right opportunities. We may reach out to you if there is a particular project that fits your skills, but in the meantime please move on to step #3.

Step 3: Decide how you'd like to help

Improve add-ons in Firefox

Add-ons make Firefox the most extensible browser available. Your contributions help support user freedom!

Develop WebExtensions APIs

WebExtensions are 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. We need your help extending the APIs to support the needs of add-on developers. You'll need to know some JavaScript.

  1. Familiarize yourself with the on-boarding materials: Onboard to Firefox codebase
  2. Pick a "Good First Bug" to work on
  3. Not a first-timer? See a list of approved APIs and start contributing. And see more ways to hack
Contribute to the Add-on Manager

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

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

If you know JavaScript and/or Python, you can help make AMO better!

  1. Familiarize yourself with the on-boarding materials: Webdev Bootcamp
  2. Set up a development environment on your local machine: Our documentation provides step-by-step instructions on how to set up your local development environment. If you run into any issues or have questions, please go here for help. Or, jump into the #amo channel on
  3. Select a "Good First Bug" to work on. These bugs are mentored and they are a great way to get a feel for things.

What's Next?

Get recognized

When your first pull request is merged, please report it here so we can properly celebrate your first contribution!

Pick another bug

Select another “good first bug” to get more practice, or move on to a “good second bug”!

You can also look for bugs with the label "contrib: welcome" on Github.

Need guidance?

Please feel free to reach out to one of our community mentors! The two best ways to reach out are: