How to make a Firefox theme tutorial!

Theme development!
Style Mozilla applications the way you want with pixel-perfect themes.

Getting Started

Creating a Skin for Firefox
Learn how to find the right files to edit, make your changes, and package up your new theme in this tutorial.

How to Create a Firefox Theme
Thomas McMahon explains how to create a Firefox theme from start-to-finish in this tutorial.

Theme Development

Theme Packaging
This article explains the packaging of themes.

First Steps in Theme Design
This blog post by Lim Chee Aun explains the use of -moz-image-region in themes.

Making Sure Your Theme Works with RTL Locales
It's important to make sure your theme works in all locales. This article explains how to tweak your theme to look great for users who browse in right-to-left.

Theme Documentation Index
If you haven't found what you're looking for yet, try the Mozilla Developer Center's Themes section.

How to make a Firefox add-on tutorial:extension development:Advanced Topics

Video:
Stupid/Awesome Extension Development Hacks
In this video, Jono Xia explains how to go further in extension development using XPCOM, overlays, XHRs, DOM manipulation, etc. in order to make Firefox do things you might have never thought possible.

JavaScript Code Modules
JavaScript code modules let multiple privileged JavaScript scopes share code. For example, a module could be used by Firefox itself as well as by extensions, in order to avoid code duplication.

Creating Custom Firefox Extensions with the Mozilla Build System
This article describes how to set up the development environment for a large, complex Firefox extension with a need for high-performance, use of third-party libraries in C/C++, or interfaces not exposed via XPCOM.

Multiple Item Packaging
This article explains how to create an extension package with multiple items "extensions".

Extension Documentation Index
If you can't find what you're looking for in the above articles, try the Mozilla Developer Center's Extensions landing page.

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How many Firefox users have add-ons installed? 85%!

The revamped Add-ons Manager in Firefox 4 provides a rich experience for add-on discovery and management, and to power that service Mozilla receives aggregate data on add-on usage. We previously estimated that at least a third of Firefox users had chosen to install an add-on, but knew the number was higher than that.
We’re very excited to report that 85% of Firefox 4 users have chosen to install an add-on — that’s more than 60 million users every day! This number doesn’t include Personas, and even excludes popular add-ons bundled with other software that the user hasn’t actively agreed to install.

Firefox 4 desktop add-on usage from March 22 through June 19, 2011, excluding Personas and several commonly-bundled add-ons

When we first saw this number, we expected it to drop as more and more users upgraded to Firefox 4; remarkably, it has stayed between 89% and 85% since launch in March. It’s also interesting to note that on the weekends when Firefox (and Internet) usage slumps, the percentage of users with add-ons increases, indicating those who browse on weekends are more likely to have customized Firefox.
We’ve also learned that on average, users have 5 add-ons installed, with the following distribution:

Firefox 4 desktop add-on distribution from June 19, 2011, excluding Personas and several commonly-bundled add-ons

With more than 2.5 billion downloads and 580 million add-ons in use every day in Firefox 4 alone, there’s no better time to browse our gallery and make Firefox your own.

Source:http://blog.mozilla.com/addons/

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