Welcome to the Firefox codebase!
--------------------------------

This page is here to help you get from "I want to build Firefox"
to "I'm building my own Firefox" to "I can contribute to Firefox". 
So if you'd like to help Mozilla build the best web browser in the
world, you're in the right place.

.. rubric:: Need help?
   :name: Need_help

The Mozilla community prides itself on being an open, accessible, and
friendly community for new participants. If you have any difficulties
getting involved or finding answers to your questions, please `come and
ask your questions in our
chatroom <https://chat.mozilla.org/#/room/#introduction:mozilla.org>`_,
where we can help you get started.

We know even before you start contributing that getting set up to work
on Firefox and finding a bug that's a good fit for your skills can be a
challenge, and we're always looking for ways to improve this process: making
Mozilla more open, accessible, and easier to participate with. If you're
having any trouble following this documentation, or hit a barrier you
can't get around, please join us in the the Introduction room on Matrix
or contact Mike Hoye directly at mhoye@mozilla.com. 

What skills do I need?
----------------------

Mozilla is a large project and we are thrilled to have contributors with
very diverse skills:

-  If you know **C++,** **Rust,** **JavaScript,** **HTML** or **CSS**,
   you can contribute to the core layers of Firefox and many other Mozilla
   projects. 
-  If you know **Rust**, you can also contribute to the Rust programming
   language itself, and `Servo <https://servo.org/>`_, the web browser engine
   designed for parallelism and safety.
-  If you know **Java**, you can contribute to Firefox on Android,
   `Firefox Focus for
   Android <https://github.com/mozilla-mobile/focus-android>`_ .
-  If you know **Kotlin**, you can contribute to `Firefox
   Preview <https://github.com/mozilla-mobile/fenix>`_ (code name:
   "Fenix").
-  If you know **Swift**, you can contribute to `Firefox for
   iOS <https://github.com/mozilla-mobile/firefox-ios>`_ and `Firefox
   Focus for iOS <https://github.com/mozilla-mobile/focus-ios>`_
-  If you know **Python**, you can contribute to our web services,
   including Firefox Sync and Firefox Accounts
-  If you know **Make**, **shell**, **Perl**, or **Python**, you can
   contribute to our build systems, release engineering, and automation
-  If you know **C**, you can contribute to NSS, Opus, and Daala
-  There are even many ways to contribute to the Mozilla mission without
   programming. If getting involved in design, support, translation,
   testing, or other types of contributions sparks your interest please
   see the `Volunteer Opportunities
   wiki <https://contribute.mozilla.org>`_ or the `Mozilla
   community <https://mozilla.community/>`_ site.

Perhaps you do not know programming yet, but you want to start learning?
There are `plenty of
resources <https://developer.mozilla.org/learn>`_ available on
the MDN Web Docs!

Read on for information about how to set up your machine to build Firefox.