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*Thanks to [https://github.com/aterranova-bv aterranova-bv] for the new [https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Examples#Emoji_Substitution Emoji Substitution WebExtension Example]!
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=Evolution in Add-on Development=
[[https://developer.mozilla.org/en-US/Add-ons/WebExtensions|WebExtensions]] are becoming have become the standard for add-on development in Firefox. It will be the only type of add-on supported in Firefox by the end of 2017with the release of [https://wiki.mozilla.org/RapidRelease/Calendar Firefox 57].
This page contains timelines, tutorials, and other resources to help you port your add-on to WebExtensions. If you're looking for resources on creating a new add-on, please head over to [https://developer.mozilla.org/en-US/Add-ons/WebExtensions MDN].
=====What's New=====
*Use [https://blog.mozilla.org/addons/2017/01/20/migrating-to-webextensions-port-your-stored-data/ Embbeded WebExtensions] to port your stored data
*[http://webextensions-experiments.readthedocs.io/ WebExtensions Experiments]: prototype WebExtension APIs without having to build Firefox
*Help plan and prioritize WebExtensions APIs by joining the new bi-weekly [[Add-ons/Contribute/Triage|public triage]].
=Timelines & Roadmaps=
*If you just want to request a WebExtensions API, please [https://bugzilla.mozilla.org/enter_bug.cgi?product=Toolkit&component=WebExtensions:%20Untriaged file a bug]. These will be triaged and processed in a [[Add-ons/Contribute/Triage|bi-weekly public meeting]].
[https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Embedded_WebExtensions Embedded WebExtensions] - In Firefox 51, you will be able to You can now embed a WebExtensions add-on inside an existing SDK or bootstrapped add-on. This is especially useful to developers of SDK or bootstrapped add-ons who want to start migrating to WebExtensions and take advantage of new APIs like Native Messaging, but can’t fully migrate yet. It’s also useful for developers who want to complete data migration towards WebExtensions, and who want to take parts of their add-on that are not compatible with [https://developer.mozilla.org/en-US/Firefox/Multiprocess_Firefox multiprocess Firefox] and make them compatible.
Not all add-ons will be able to migrate to WebExtensions without having to drop any features. But we want to work with you to get as many add-ons migrated as possible with the functionality you created intact. We invite you to contribute to its evolution, and we look forward to [[Add-ons/developer/communication#Get_in_Touch|working with you]].
=Tools=
*[https://compatibility-lookup.services.mozilla.com/ Lookup tool] to check your add-on type and get porting resource recommendations
*[https://blog.mozilla.org/addons/2017/01/20/migrating-to-webextensions-port-your-stored-data/ Embbeded WebExtensions] are available to port your stored data
*[https://github.com/mi-g/weh WebExtensions Helper] speeds up browser add-ons development by providing facilities for WebExtensions-based (Firefox, Chrome, Opera and Edge) extensions
*[https://github.com/yeoman/generator-chrome-extension Chrome Extension generator] creates everything you need to get started with extension development. You can choose Browser UI(Browser,Page Action, Omnibox) type and select permissions you need.
=Blog Posts=
*Jan 25, 2017: [https://blog.mozilla.org/addons/2017/01/25/webextensions-in-firefox-53/ WebExtensions in Firefox 53]
*Jan 20, 2017: [https://blog.mozilla.org/addons/2017/01/20/migrating-to-webextensions-port-your-stored-data/ Migrating to WebExtensions: port your stored data]
*Dec 16, 2016: [https://blog.mozilla.org/addons/2016/12/16/meet-some-nifty-new-webextensions/ Meet Some Nifty New WebExtensions]
*Nov 23, 2016: [https://blog.mozilla.org/addons/2016/11/23/add-ons-in-2017/ Add-ons in 2017]
*Nov 22, 2016: [https://blog.mozilla.org/addons/2016/11/22/webextensions-examples-and-hacktoberfest/ webextensions-examples and Hacktoberfest]
*Nov 18, 2016: [https://blog.mozilla.org/addons/2016/11/18/webextensions-in-firefox-52/ WebExtensions in Firefox 52]
*Nov 3, 2016: [https://blog.mozilla.org/addons/2016/11/03/more-ways-to-contribute-to-webextensions/ More ways to contribute to WebExtensions]
