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    Extensions

    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. They allow the application to be customized to fit the personal needs of each user if they need additional features, while keeping the applications small to download.

    Extensions are different from plugins, which help the browser display specific content like playing multimedia files. Extensions are also different from search plugins, which plug additional search engines in the search bar.

    Documentation

    General (applicable to all Mozilla apps)

    Setting up an extension development environment
    A few essential setup tips that make extension development easier.
    Bootstrapped extensions
    How to create extensions that can be installed, uninstalled, and upgraded without requiring an application restart.
    XUL School Tutorial
    A comprehensive extension development tutorial.
    Building an Extension
    Introductory tutorial for creating a basic extension.
    Inline options
    How to use the new preference UI that appears inline in the Add-on Manager window starting in Firefox 7.
    Security best practices in extensions
    Guide for developers to ensure users of the extension are safe.
    Performance best practices in extensions
    How to build extensions that perform well and don't hurt application performance.
    Extension etiquette
    General extension best practices to make the user experience as good as possible.
    Extension packaging
    How to package your extension for downloading and installation.
    XUL
    Documentation for XUL, the markup language used for describing user interfaces for Mozilla extensions.
    Performance
    Performance guides and utilities to help you make your add-on perform well (and to play nicely with others).
    Installing extensions
    How to programmatically install extensions.
    Submitting an add-on to AMO
    How to distribute your add-on using the AMO web site.
    Extension Frequently Asked Questions
    Common questions and answers about extension development.

    Application Specific

    Firefox

    Thunderbird

    SeaMonkey
      Extensions support in SeaMonkey 2

    Firefox for Android

    Fennec (mobile browser)

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    Document Tags and Contributors

    Contributors to this page: Editmonkey
    Last updated by: Editmonkey,