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    Legacy extensions

    This page contains links to documentation for the approach to developing extensions for Gecko-based applications which uses:

    • XUL overlays to specify the interface
    • APIs available to privileged code, such as tabbrowser and JavaScript modules, to interact with the application and content.

    Prior to Firefox 4, and the Gecko 2 engine that powers it, this was the only way to develop extensions. This methodology has largely been superseded by restartless extensions, and the Add-on SDK, which is built on top of them. The privileged JavaScript APIs described here can still be used in these newer types of add-ons.

    XUL School

    XUL School is a comprehensive add-on development tutorial, focusing on Firefox extension development but mostly applicable to other Gecko-based applications.

    More resources

    Setting up your environment
    Setting up the application for extension development.
    XUL
    Tutorials and reference for the user interface language used by XUL extensions.
    Code snippets
    Sample code for many of the things you'll want to do.
    Installing extensions
    How to install an extension by copying the extension files into the application's install directory.
    Firefox add-ons developer guide
    A guide to developing overlay extensions.
    JavaScript code modules
    JavaScript modules available to extension developers.
    Extension preferences
    How to specify the preferences for your extension that will appear in the Add-ons Manager.
    Extension packaging
    How extensions are packaged and installed.
    Binary Firefox extensions
    Creating binary extensions for Firefox.

     

    Document Tags and Contributors

    Contributors to this page: jswisher, Sheppy, kmaglione, wbamberg, Jez9999, lorchard_mozilla, gonzipc
    Last updated by: wbamberg,
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