Guides

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

Getting Started: Learn how to contribute to the SDK: getting the code, opening/taking a bug, filing a patch, getting reviews, and getting help.
Modules: 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.

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.

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 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.

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