JavaScript code modules let multiple privileged JavaScript scopes share code. For example, a module could be used by Firefox itself as well as by extensions, in order to avoid code duplication.
General topics
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Using JavaScript code modules
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An introduction to how to use JavaScript code modules.
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Component.utils.import
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How to import a JavaScript code module.
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Component.utils.unload
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How to unload a JavaScript code module.
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Code snippets: Modules
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Examples of how to use code modules.
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Mozilla Labs JS Modules
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This page features a list of JS modules, along with download links and documentation, that extension developers can use in their code.
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Standard code modules
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AddonManager.jsm
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Interface to install, manage, and uninstall add-ons.
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AddonRepository.jsm
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Allows searching of the add-ons repository.
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Assert.jsm
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Implements the CommonJS Unit Testing specification version 1.1, which provides a basic, standardized interface for performing in-code logical assertions with optional, customizable error reporting.
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ctypes.jsm
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Provides an interface that allows JavaScript code to call native libraries without requiring the development of an XPCOM component.
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DeferredTask.jsm
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Run a task after a delay.
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Dict.jsm
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Provides an API for key/value pair dictionaries.
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DownloadLastDir.jsm
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Provides the path to the directory into which the last download occurred.
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Downloads.jsm
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Provides a single entry point to interact with the downloading capabilities of the platform.
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FileUtils.jsm
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Provides helpers for dealing with files.
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Geometry.jsm
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Provides routines for performing basic geometric operations on points and rectangles.
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ISO8601DateUtils.jsm
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Provides routines to convert between JavaScript
Date objects and ISO 8601 date strings.
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Log.jsm (formerly log4moz)
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Provides a log4j style API for logging log messages to various endpoints, such as the Browser Console or a file on disk. This module was formerly
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NetUtil.jsm
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Provides helpful networking utility functions, including the ability to easily copy data from an input stream to an output stream asynchronously.
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openLocationLastURL.jsm
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Provides access to the last URL opened using the "Open Location" option in the File menu.
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osfile.jsm
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Provides routines to access files. Read, write, rename, create directories, ...
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PerfMeasurement.jsm
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Provides access to low-level hardware and OS performance measurement tools.
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PluralForm.jsm
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Provides an easy way to get the correct plural forms for the current locale, as well as ways to localize to a specific plural rule.
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PopupNotifications.jsm
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Provides an easy way to present non-modal notifications to users.
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Promise.jsm
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Implements the Promises/A+ proposal as known in April 2013.
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Services.jsm
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Provides getters for conveniently obtaining access to commonly-used services.
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source-editor.jsm
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The Source Editor is used by developer tools such as the Style Editor; this interface implements the editor and lets you interact with it.
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Sqlite.jsm
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A Promise-based API to
mozIStorage /SQLite.
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Task.jsm
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Implements a subset of Task.js to make sequential, asynchronous operations simple, using the power of JavaScript's
yield operator.
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Timer.jsm
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A pure JS implementation of
window.setTimeout .
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XPCOMUtils.jsm
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Contains utilities for JavaScript components loaded by the JS component loader.
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