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'''If you are looking for documentation on how to develop a WebExtension add-on an extension with WebExtensions APIs with Firefox, [https://developer.mozilla.org/en-US/Add-ons/WebExtensions please checkout check out MDN].'''
This page is an introduction to Mozilla's implementation of WebExtensions, a new browser extension API. The goals of this API are:
* Porting add-ons to and from other browsers should be easier.
* Reviewing add-ons for addons.mozilla.org (AMO) should be easier.* WebExtensions must be compatible Compatibility with multiprocess Firefox ([[Electrolysis]]).
* Changes to Firefox's internal code should be less likely to break add-ons.
* WebExtensions APIs should be easier to use than the existing Firefox XPCOM/XUL APIs.* WebExtensions APIs should maintain acceptable security and privacy standards.
Much of the specifics of the new API are similar to the Blink extension API. Google has [https://developer.chrome.com/extensions extensive documentation on the API]. [https://dev.opera.com/extensions/ So does Opera]. But the [https://developer.mozilla.org/en-US/Add-ons/WebExtensions Firefox docs on MDN] are the best.
* Join us on [[IRC|IRC]] at #webextensions or #addons
== Testing out the WebExtensions API APIs ==
See [https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Your_first_WebExtension Your first WebExtensionextension] on MDN.
= Technical Details =
== Out-of-process Extensions ==
Technical details about the implementation are published at [[WebExtensions/Implementing_APIs_out-of-process]].
== Packaging ==
Extensions are packaged as standard Zip files, but with <code>.xpi</code> extensions. In the future, we're planning to move towards whatever what the W3C WG recommends.
See https://developer.chrome.com/extensions/manifest for a complete list of manifest directives.
