Getting Started

Learn the basics of developing an extension on the Mozilla platform with this section full of beginner's guides.

Extension Development

Once you know the basics, these guides will help you with intermediate to advanced extension development topics.

Thunderbird & Mobile Add-ons

Add-ons aren't just for Firefox. Learn how to extend other Mozilla applications, such as the Thunderbird mail client and Firefox for mobile devices.

Theme Development

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

Other Types of Add-ons

Find information on Search Plug-ins, Jetpack, Themes, and other types of add-ons here.