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Mozilla based software is typically extensible through add-ons. There are three primary types of add-on: extensions, plugins, and themes. This page will help guide you to the information you need in order to create add-ons for Firefox, Thunderbird, or other software based on the Mozilla platform, as well as how to distribute your add-ons.
Provides helpful information for add-on developers to help them properly package and deliver their add-ons. This includes information about addons.mozilla.org, Mozilla's add-on distribution web site.
Extensions add new functionality to Mozilla applications such as Firefox, SeaMonkey and Thunderbird. They can add anything from a toolbar button to a completely new feature.