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*[https://blog.mozilla.org/addons/2015/08/21/the-future-of-developing-firefox-add-ons/ The Future of Developing Firefox Add-ons]
*[https://compatibility-lookup.services.mozilla.com/ Compatibility Lookup Tool]
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=====What's New=====
*[http://webextensions-experiments.readthedocs.io/ WebExtension Experiments]: prototype WebExtension APIs without having to build Firefox!*We're helping to make it easier to port to WebExtensions with [https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Embedded_WebExtensions Embedded WebExtensions] : we're making it easier to port to WebExtensions in Firefox 51*Help plan and prioritize WebExtensions APIs by joining the bi-weekly [https://wiki.mozilla.org/Add-ons/Contribute/Triage public triage]
*[https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Porting_a_legacy_Firefox_add-on Porting guides that map SDK and XUL APIs to available WebExtensions APIs]
*[https://developer.mozilla.org/en-US/Add-ons/WebExtensions How-to guides] covering common add-on developer cases, like [https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Intercept_HTTP_requests intercepting web requests] and [https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Add_a_button_to_the_toolbar adding a button to the toolbar]
The transition to WebExtensions impacts add-ons built on APIs like XUL and XPCOM most of all. We expect to remove support for these technologies in Firefox add-ons by the end of 2017. We hope this will give us enough time to help you migrate and provide WebExtension APIs that are suitable for replacing the features you might lose once we stop supporting these APIs.
If you’ve already updated your add-on for multiprocess Firefox (e10s) compatibility, thank you for clearing this hurdle. If not, [https://developer.mozilla.org/en-US/Add-ons/Working_with_multiprocess_Firefox find out how]. To get started migrating to WebExtensions, check the [https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/Comparison_with_XUL_XPCOM_extensions XUL/XPCOM-WebExtensions comparison chart] to see if the APIs you need are available. Additional resources can be found [[Add-ons/developer/communication#Managing_the_Impact|below]]. For assistance, please join the [https://mail.mozilla.org/listinfo/dev-addons dev-addons@mozilla.org] mailing list and ask for help!
=Managing the Impact=
*'''Embedded WebExtensions''' - In Firefox 51, you can [https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Embedded_WebExtensions 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 multiprocess Firefox and make them compatible.
*[http://webextensions-experiments.readthedocs.io/ WebExtension Experiments] - now it's easier to prototype WebExtension APIs, and you can do it without having to build Firefox.
*We're always adding new [https://developer.mozilla.org/en-US/Add-ons/WebExtensions WebExtensions documentation], so please check them out! *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 [https://wiki.mozilla.org/Add-ons/developer/communication#Get_in_Touch working with you].
=Add-on Developer Communication Calendar=
=Blog Posts and Other Resources=
==WebExtensions==
*Jan 9, 2016: [https://discourse.mozilla-community.org/t/webextensions-first-impressions/6459 WebExtensions First Impressions]
*Dec 21, 2015: [https://blog.mozilla.org/addons/2015/12/21/webextensions-in-firefox-45-2/ WebExtensions in Firefox 45]
*Aug 21, 2015: [https://blog.mozilla.org/addons/2015/08/21/the-future-of-developing-firefox-add-ons/ The Future of Developing Firefox Add-ons]
=====Other Resources=====
*[https://compatibility-lookup.services.mozilla.com/ Compatibility Lookup Tool]
*[https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Embedded_WebExtensions Embedded WebExtensions] let you [https://blog.mozilla.org/addons/2016/09/29/webextensions-in-firefox-51/ embed] a WebExtensions add-on inside an existing SDK or bootstrapped add-on
*[https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Comparison_with_the_Add-on_SDK Comparison with the Add-on SDK]
