Here is a list of everything available in case anyone might find that more conve...

Here is a list of everything available in case anyone might find that more convenient:

Languages:

  - C
  - C++
  - C++ (Firefox)
  - Java
  - JavaScript
  - PHP
  - Python
  - Rust

  So you think OOP is for hipsters?
  That's cool, we all get nostalgic sometimes. You could work on:

  - NSS: The network security pieces of Firefox
    https://developer.mozilla.org/en-US/docs/Getting_Started_With_NSS

C++

  So you like long compile times and incomprehensible error messages?
  That's cool, we do too. You could work on:

  - Gecko: The engine that drives Firefox
    See: C++ (Firefox)

  - Boot2Gecko: The operating system for Android phones built on web technologies
    https://wiki.mozilla.org/B2G/Hacking

  - Thunderbird: The open source email client
    http://developer.mozilla.org/En/Simple_Thunderbird_build

  - Seamonkey: The open source web productivity suite
    http://www.seamonkey-project.org

  - v8monkey: Implementing the v8 API on top of Spidermonkey
    http://github.com/zpao/v8monkey

  - emscripten: Creating a LLVM-to-JS system to allow porting native code to the web
    https://github.com/kripken/emscripten/

  - SVG Project: Help with the implementation and testing of Mozilla's
    Scalable Vector Graphics engine (https://developer.mozilla.org/en-US/docs/SVG)
    https://wiki.mozilla.org/SVG:Contribute

  - Windows 8 Integration: The Metro-style enabled desktop browser for Windows 8
    https://wiki.mozilla.org/Firefox/Windows_8_Integration
      See 3.3 Platform Integration Windows 8 Development

  - MathML: Display and represent math formulas on the web
    https://wiki.mozilla.org/MathML:Home_Page

C++ (Firefox)

  That's cool, but not very specific. You could work on:

  - General Firefox work: I don't really care about the details
    http://developer.mozilla.org/En/Introduction

  - Graphics: Lots of work with OpenGL, DirectX, and Skia making things draw quickly
    https://wiki.mozilla.org/Platform/GFX/Contribute

  - Accessibility:
    Make the web more accessible for users using
      assistive technologies (eg. screenreaders)
    https://wiki.mozilla.org/Accessibility/Contribute

  - Networking: Tcp, http, ssl/tls, spdy, and more
    http://wiki.mozilla.org/Networking

  - Spidermonkey:
    The JavaScript engine: if you like compilers, interpreters, JITs, and more
    https://wiki.mozilla.org/JavaScript:New_to_SpiderMonkey

JavaScript

  So you're a dynamic individual who thinks that, underneath,
  everything is an object? That's cool, we like to dream as well.
  You could work on:

  - Firefox: Did you know that all of the UI is written in JS?
    See: JavaScript (Firefox)

  - Mobile Firefox:
    It's the Gecko engine, with an Android-specific UI. No Android device required.
    https://wiki.mozilla.org/Mobile/Get_Involved

  - pdf.js: A PDF viewer written entirely in JavaScript
    https://wiki.mozilla.org/PDF.js

  - Shumway: a Flash player written entirely in JavaScript
    https://github.com/mozilla/shumway/wiki

  - The addon SDK: The foundation upon which all new kick-ass addons are built
    https://wiki.mozilla.org/Jetpack

  - Gaia: the default UI for the web-based mobile operating system Boot2Gecko
    https://wiki.mozilla.org/Gaia

  - DXR: The intelligent source code indexing system
    http://github.com/mozilla/dxr

  - Thunderbird: The open source email client
    http://developer.mozilla.org/En/Simple_Thunderbird_build

  - Seamonkey: The open source web productivity suite
    http://www.seamonkey-project.org

  - Web development: We have many large, complicated projects that use JavaScript
    https://blog.mozilla.com/webdev/get-involved/

  - Popcorn: Create interactive media pages that seamlessly integrate video,
    audio, and traditional web technologies
    http://www.benmoskowitz.com/?p=527

  - Windows 8 Integration:
    The front end for the Metro-style enabled desktop browser for Windows 8
    https://wiki.mozilla.org/Firefox/Windows_8_Integration
      See 3.2 Front End Windows 8 Development

  - Persona: Implement a new way to safely and easily sign into websites
    https://wiki.mozilla.org/Persona

JavaScript (Firefox)

  Good choice - there are a lot of different areas if you'd like to specialize.
  You could work on:

  - Firefox in general - I don't really care:
    http://developer.mozilla.org/En/Introduction

  - Developer tools:
    Implement a suite of tools similar to Firebug directly in the browser
    https://wiki.mozilla.org/DevTools/GetInvolved

  - Sync: Help users take their personal browsing data on the road
    https://wiki.mozilla.org/Services/Sync#Get_Involved

Java

  So you're a believer in AbstractMethodFactoryBeans?
  That's cool, we all have our vices. You could work on:

  - Mobile Firefox:
    It's the Gecko engine, with an Android-specific UI. No Android device required.
    https://wiki.mozilla.org/Mobile/Get_Involved

  - Rhino: It's Spidermonkey in Java. Is this actually still a thing?
    https://developer.mozilla.org/en-US/docs/Rhino

PHP

  So you like your variable names to include dollar signs?
  That's cool, everyone misses Perl once in a while. You can work on:

  - WordPress: The code that runs our blogs (http://blog.mozilla.org)
    https://wiki.mozilla.org/Webdev/GetInvolved/WordPress

  - Marketplace: The PHP client for Marketplace (https://marketplace.firefox.com)
    https://github.com/mozilla/Marketplace.PHP

  - The Mediawiki-Bugzilla plugin:
    The Bugzilla plugin for Mozilla's MediaWiki https://wiki.mozilla.org
    https://github.com/mozilla/mediawiki-bugzilla

Python

  So you enjoy the paradigm of backtrace-driven development?
  That's cool, everyone gets a bit tired of static typing once in a while.
  You can work on:

  - Firefox: Lots of code is generated by python scripts
    http://developer.mozilla.org/En/Introduction

  - Web development: We have many large, complicated projects written in Python
    https://blog.mozilla.com/webdev/get-involved/

  - DXR: The intelligent source code indexing system
    http://github.com/mozilla/dxr

  - Tools & Automation:
    Various projects to facilitate easier automated testing of products
    https://wiki.mozilla.org/Auto-tools/New_Contributor

Rust

  The new systems programming language created by Mozilla.

  - Rust: http://www.rust-lang.org