The articles below will help you get your hands on the Mozilla source code, learn to navigate the code, and how to get the changes you propose checked into the tree.

1. Mozilla Firefox For Windows 10
2. Mozilla Firefox Online Open
3. Mozilla Firefox Start Page Browser
4. Mozilla Firefox Online Search

Download Mozilla Firefox, a free web browser. Firefox is created by a global not-for-profit dedicated to putting individuals in control online. Get Firefox for Windows, macOS, Linux, Android and iOS today!

1. Mozilla Firefox (64-bit) - Mozilla Firefox is a fast, light and tidy open source web browser. At its public launch in 2004 Mozilla Firefox was the first browser to challenge Microsoft Internet Explorer’s dominance.
2. If you think this add-on violates Mozilla's add-on policies or has security or privacy issues, please report these issues to Mozilla using this form. Please don't use this form to report bugs or request add-on features; this report will be sent to Mozilla and not to the add-on developer.
3. Firefox Mac OS X 10.9, 10.10 and 10.11 users move to Extended Support Release Firefox 78 is the last supported version for Mac OS X 10.9, 10.10 and 10.11. Users will be moved to Firefox Extended Support Release (ESR).
4. Introducing Mozilla Firefox. Mozilla is a free software collective that has been active since 1998. Originating as an offshoot from Netscape (which at that stage was starting to commercialize its operations), Mozilla had the idea of creating an open source, free web browser – as well as add-ons like mail clients.

Mercurial Overview

If you plan to contribute to the Mozilla project, the best way to get the code is to check it out from the version control repository. Learn how to do that here.

Downloading Source Archives

If you want to fetch the code for a specific release of a particular Mozilla product, you may prefer to download a source code archive.

Use Searchfox

Use Searchfox, Mozilla's online search and browsing tool for accessing the source code. This isn't a good way to download the code, but is a great way to search it.

Firefox Source Code Directory Structure

Learn about the various folders in the Firefox source tree, and how to find what you're looking for.

Good first bugs

If you are new to the project and want something to work on, look here.

Mozilla Firefox For Windows 10

Firefox coding style

The code style guide provides information about how you should format your source code to ensure that you don't get mocked by the reviewers.

Interface development guide

Guidelines and documentation for how to create and update XPCOM interfaces.

The Firefox codebase: CSS Guidelines

This document contains guidelines defining how CSS inside the Firefox codebase should be written, it is notably relevant for Firefox front-end engineers.

SVG Cleanup Guide

Guidelines and best practices for shipping new SVGs.

Try Servers

Mozilla products build on at least three platforms. If you don't have access to them all, you can use the try servers to test your patches and make sure the tests pass.

How to submit a patch

Once you've made a change to the Mozilla code, the next step (after making sure it works) is to create a patch and submit it for review. This article needs to be updated fully for Mercurial.

Getting commit access to the source code

Feel ready to join the few, the proud, the committers? Find out how to get check-in access to the Mozilla code.

Getting older Mozilla code from CVS

Older versions of the Mozilla source code, as well as the current versions of NSS and NSPR, are kept in a CVS repository. Learn about that in this article.

You are currently viewing a snapshot of www.mozilla.org taken on April 21, 2008. Most of this content ishighly out of date (some pages haven't been updated since the project began in 1998) and exists for historical purposes only. Ifthere are any pages on this archive site that you think should be added back to www.mozilla.org, please file a bug.

• Firefox Help

Welcome to Firefox Help, the online help resource for the Mozilla Firefox web browser.

Mozilla Firefox Online Open

Have a Specific Question?

New to Mozilla Firefox?

Start by walking through Nidelven IT's step-by-step tutorial, or browse the responses to some Frequently Asked Questions about Firefox.

Are you interested in learning more about the configuration possibilities in Firefox? Read the Options/Preferences Window Reference.

Mozilla Firefox Start Page Browser

Experienced users may also want to check out these tips and tricks for customizing Firefox and learn how to edit the configuration files manually.

Mozilla Firefox Online Search

© 2002-2007 David Tenser.