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.