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    This page lists more theoretical in-depth articles about the SDK.

    Contributor's guide

    Getting Started
    Learn how to contribute to the SDK: getting the code, opening/taking a bug, filing a patch, getting reviews, and getting help.
    Learn about the module system used by the SDK (which is based on the CommonJS specification), how sandboxes and compartments can be used to improve security, and about the built-in SDK module loader, known as Cuddlefish.
    Classes and Inheritance
    Learn how classes and inheritance can be implemented in JavaScript, using constructors and prototypes, and about the helper functions provided by the SDK to simplify this.
    Private Properties
    Learn how private properties can be implemented in JavaScript using prefixes, closures, and WeakMaps, and how the SDK supports private properties by using namespaces (which are a generalization of WeakMaps).
    Content Processes
    The SDK was designed to work in an environment where the code to manipulate web content runs in a different process from the main add-on code. This article highlights the main features of that design.
    Testing the Add-on SDK
    Learn how to run the Add-on SDK test suites.

    SDK infrastructure

    Module structure of the SDK
    The SDK, and add-ons built using it, are of composed from reusable JavaScript modules. This explains what these modules are, how to load modules, and how the SDK's module tree is structured.
    SDK API lifecycle
    Definition of the lifecycle for the SDK's APIs, including the stability ratings for APIs.
    Program ID
    The Program ID is a unique identifier for your add-on. This guide explains how it's created, what it's used for and how to define your own.
    Firefox compatibility
    Working out which Firefox releases a given SDK release is compatible with, and dealing with compatibility problems.

    SDK idioms

    Working With Events
    Write event-driven code using the the SDK's event emitting framework.
    Content scripts guide
    An overview of content scripts, including: what they are, what they can do, how to load them, how to communicate with them.
    Two Types of Scripts
    This article explains the differences between the APIs available to your main add-on code and those available to content scripts.

    XUL migration

    XUL Migration Guide
    Techniques to help port a XUL add-on to the SDK.
    XUL versus the SDK
    A comparison of the strengths and weaknesses of the SDK, compared to traditional XUL-based add-ons.
    Porting Example
    A walkthrough of porting a relatively simple XUL-based add-on to the SDK.

    Multiprocess Firefox

    Multiprocess Firefox and the SDK
    How to check whether your add-on is compatible with multiprocess Firefox, and fix it if it isn't.

    Join the Add-on SDK community

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    Document Tags and Contributors

    Contributors to this page: wbamberg, evold
    Last updated by: evold,
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