Classic Theme Restorer is an add-on which I and many others find
crucial for usability. What will the upgrade path for it be, or will
there be a similar add-on to replace it? If not, Firefox will probably
lose a lot of users to Chrome.


On Mon, 22 Jan 2018 14:04:16 -0800
Shell Escalante <sescala...@mozilla.com> wrote:

> 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
> dev-add...@mozilla.org 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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