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Although Mozilla's major, core projects are located on the Mozilla Mercurial server, such as mozilla-central, there are a number of tools, services, and so forth whose code is hosted on GitHub. This article offers a quick guide to getting started with Mozilla code on GitHub as well as a list of many of the most interesting GitHub repositories containing Mozilla project code.


You can look at code on GitHub without an account; that's the first thing you should know. To do more—that is, to contribute to the code or to fork it and start your own project based on Mozilla-related code—you'll need a GitHub account. You can learn more about setting up an account on the GitHub site.

Most Mozilla project code is located in repositories owned by the user Mozilla. That's a great place to start looking for any projects not listed below.


This list covers the larger-scale and more important projects we have hosted on GitHub. It's not an authoritative, complete list, since it's hard to keep track of all the smaller projects that crop up (and even, at times, the large ones!). You can see a complete list of Mozilla projects on GitHub.

Project name Description
PDF.js A Portable Document Format (PDF) reader written entirely in JavaScript.
Shumway Shumway is a Flash VM and runtime written in JavaScript.
addon-sdk The Mozilla Add-on SDK.
asknot The What Can I Do For Mozilla web site, which helps you figure out how you can contribute to Mozilla.
bugsahoy A Web page to help new Mozilla contributors find bugs to work on.
bugzilla-dashboard A convenient dashboard to help you get an overview of your bugs.
codefirefox The CodeFirefox site, with videos and tutorials about how to contribute to the Firefox project and Mozilla code in general.
dxr An intelligent tool for browsing source code.
emscripten The Emscripten LLVM-to-JavaScript compiler.
fxdt-adapters The Firefox Developer Tools Adapter lets you debug various remote targets from the Firefox Developer Tools.
gecko-dev A read-only mirror of the Mercurial repositories used for Mozilla private code.
kitsune Kitsune is the platform that drives the Mozilla support web site, SUMO.
kuma The Django project that powers this site (MDN).
mdn Code samples for the MDN Web site.
mozbrick The Mozilla Brick project.
mozilla-B2G The Firefox OS project.
mozilla-appmaker The Appmaker project -- a Web tool to let non-programmers create apps.
mozilla-l10n Scripts and tools used by the localization drivers.
mozilla-metrics Tools used to collect metrics about Mozilla code.
mozilla-services Mozilla cloud services projects.
opennews The Knight-Mozilla Open News project, helping the journalism/technology community do great work through shared knowledge and code.
rust-lang Rust编程语言, 为安全地进行高并发编码而设计!
servo The next-generation rendering engine.