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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
- Using JavaScript code modules
- An introduction to how to use JavaScript code modules.
- Component.utils.import
- How to import a JavaScript code module.
- Component.utils.unload
- How to unload a JavaScript code module.
- Code snippets: Modules
- Examples of how to use code modules.
- Mozilla Labs JS Modules
- This page features a list of JS modules, along with download links and documentation, that extension developers can use in their code.
Standard code modules
- AddonManager.jsm
- Interface to install, manage, and uninstall add-ons.
- AddonRepository.jsm
- Allows searching of the add-ons repository.
- Assert.jsm
- 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.
- ctypes.jsm
- Provides an interface that allows JavaScript code to call native libraries without requiring the development of an XPCOM component.
- CustomizableUI.jsm
- Allows you to interact with customizable buttons and items in Firefox's main window UI.
- DeferredTask.jsm
- Run a task after a delay.
- Dict.jsm
- Provides an API for key/value pair dictionaries.
- DownloadLastDir.jsm
- Provides the path to the directory into which the last download occurred.
- Downloads.jsm
- Provides a single entry point to interact with the downloading capabilities of the platform.
- FileUtils.jsm
- Provides helpers for dealing with files.
- Geometry.jsm
- Provides routines for performing basic geometric operations on points and rectangles.
- ISO8601DateUtils.jsm
- Provides routines to convert between JavaScript
Dateobjects and ISO 8601 date strings. - Log.jsm (formerly log4moz)
- 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
- NetUtil.jsm
- Provides helpful networking utility functions, including the ability to easily copy data from an input stream to an output stream asynchronously.
- openLocationLastURL.jsm
- Provides access to the last URL opened using the "Open Location" option in the File menu.
- OSFile.jsm
- Provides routines to access files. Read, write, rename, create directories, ...
- PerfMeasurement.jsm
- Provides access to low-level hardware and OS performance measurement tools.
- PluralForm.jsm
- 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.
- PopupNotifications.jsm
- Provides an easy way to present non-modal notifications to users.
- Promise.jsm
- Implements the Promises/A+ proposal as known in April 2013.
- Services.jsm
- Provides getters for conveniently obtaining access to commonly-used services.
- source-editor.jsm
- The Source Editor is used by developer tools such as the Style Editor; this interface implements the editor and lets you interact with it.
- Sqlite.jsm
- A Promise-based API to
mozIStorage/SQLite. - Task.jsm
- Implements a subset of Task.js to make sequential, asynchronous operations simple, using the power of JavaScript's
yieldoperator. - Timer.jsm
- A pure JS implementation of
window.setTimeout. - XPCOMUtils.jsm
- Contains utilities for JavaScript components loaded by the JS component loader.