Consequently, we have decided to deprecate add-ons that depend on XUL, XPCOM, and XBL. We don’t have a specific timeline for deprecation, but most likely it will take place within 12 to 18 months from now.* We are announcing the change now so that developers can prepare and offer feedback. Add-ons that are built using the new WebExtension API will continue to work. We will also continue supporting SDK add-ons as long as they don’t use require(‘chrome’) or some of the low-level APIs that provide access to XUL elements.
* This was posted on Aug 21, 2015
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