Hi, We are writing to let you know about changes to add-ons in Firefox that might impact you and available migration resources. Firefox 57, released in November, supports only add-ons built with the WebExtensions API <https://developer.mozilla.org/en-US/Add-ons/WebExtensions>. This means Firefox 52 ESR is the last release that will support legacy add-ons.
Back in October, we published a blog post <https://blog.mozilla.org/addons/2017/10/03/legacy-add-on-support-on-firefox-esr/> saying that support for ESR 52 will end in June 2018. *This date has been pushed back two months to August.* This changed because the next ESR version will be Firefox 60 instead of Firefox 59, to allow time to include a policy engine <https://blog.mozilla.org/futurereleases/2018/01/11/announcing-esr60-policy-engine/>that increases customization possibilities and integration into existing management systems. If you developed an add-on that has not been updated to the WebExtensions API, there is still time to do so. Documentation <https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Porting_a_legacy_Firefox_add-on> is available, and you can ask questions by emailing [email protected] or joining the #webextensions channel at irc.mozilla.org. If you are supporting users who are still using legacy add-ons, now is a good time to encourage them to check compatibility <https://support.mozilla.org/en-US/kb/frequently-asked-questions-firefox-addon>. We hope the extra time will help you transition more smoothly. Please don’t hesitate to reach out if you need any assistance. Thanks, The Add-ons Team
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