The Add-on SDK provides powerful APIs and tools that allow developers to create add-ons for Firefox using HTML, CSS and JavaScript. When your add-on is complete, we make it easy to share it with over 400 million Firefox users world wide. The Add-on SDK...

Jetpack is a project to make it easy to build Firefox add-ons using common web technologies. Tabs API Provides easy access to tabs and tab-related events. Request API Lets you easily make network requests. Add-ons can now find out when they are being...