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Mozilla has overhauled the underlying technology for add-ons to keep them compatible.

[[Find and install add-ons to add features to Firefox|Add-ons]] such as Firefox extensions add extra features to Firefox. Anyone can create an add-on and make it available to Firefox users who want to personalize their online experience. In the past, add-ons often stopped working each time a new version of Firefox was released, because developers had to update them every six weeks to keep them compatible. To address this (and other issues), we overhauled the underlying technology for building add-ons. Outside of rare instances, add-ons created with the new standard won’t break in new Firefox releases. {note}'''Note:''' Starting in Firefox 57, which will be released in November 2017, only add-ons built with this new technology will work in Firefox. These are indicated by the “Compatible with Firefox 57+” label on addons.mozilla.org (AMO). Add-ons built with the old technology are labeled “Legacy” on the about:addons tab. If an add-on does not have the "Compatible with 57+" label, or has the "Legacy" label, the developer may be in the process of transitioning to the new technology. You may find developer contact information on the right side of the add-on listing on AMO. {/note} '''We recommend that you install add-ons with the “Compatible with Firefox 57+” label to ensure compatibility with Firefox beyond November 2017.''' For more information about the new add-on technology in Firefox 57, see [https://blog.mozilla.org/addons/2017/02/16/the-road-to-firefox-57-compatibility-milestones/ this Mozilla blog post]. If you are the developer of a legacy add-on, [https://wiki.mozilla.org/Add-ons/developer/communication resources are available] to help you migrate to the new standard. <!-- This section is commented out; it is not ready to be pushed out live. This new technology is referred to as [https://developer.mozilla.org/Add-ons/WebExtensions/What_are_WebExtensions WebExtensions] If you are the developer of a legacy add-on, please visit the [https://blog.mozilla.org/addons/2017/02/16/the-road-to-firefox-57-compatibility-milestones/ compatability milestones] document. There are also [https://wiki.mozilla.org/Add-ons/developer/communication resources] availabe to help you migrate to the new standard. =Check your current add-ons= You can check to see if any of your current add-ons are built using the old technology. #In the Firefox location bar, type '''about:addons''' and hit {button Enter} #Identify if any add-ons are labeled ''legacy'' If any of your add-ons are labeled as ''legacy'', check to see if there is a newer version of the add-on. You may also reach out to the developer of the add-on to notify them that their add-on will no longer work with in Firefox. -->