Frequently asked questions - Firefox add-on technology is modernizing

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What is a legacy extension?

Extensions built using frameworks that are not compatible with Firefox 57 (such as SDK or XUL) are considered “legacy” extensions.

How can I tell if I have any legacy extensions installed?

To see if you have incompatible extensions installed, go to the Add-on Manager (Tools menu > Add-ons, or type “about:addons” in a new tab. If you have a legacy extension, you will see a note at the top of your screen like this:

Legacy extension warning

Click on the link “Show legacy extensions” to see a list of legacy extensions installed in your browser. Click on “Find a Replacement” next to each legacy extension for a recommended alternative. You can read more about this feature in our blog.

If I see the “legacy” label, does that mean my extension will break when I upgrade to 57?

Yes, add-ons labled "legacy" will most likely not work when you upgrade. However, the majority of the most popular Firefox extensions are compatible with Firefox 57. In some cases, developers will need to work up to the deadline to make their extensions compatible by the release date on November 14, 2017. Other extensions may become compatible after the deadline has passed. In these cases, the extension will automatically update when the compatible version becomes available.

If I see the "legacy" label, does that mean my extension is broken?

Yes, extensions labeled "legacy" will not work with Firefox 57. In some cases, developers will need to continue working after the release date on November 14, 2017 to make their extensions compatible. In these cases, the extension will automatically update when the compatible version becomes available.

Can you recommend replacements for my legacy extensions?

Yes! Use the extension finder utility to look up the extension you would like to replace and discover recommended replacements. You can also browse our featured collection on addons.mozilla.org (AMO) for compatible extensions, or search using the tag “Firefox 57,” to discover compatible extensions.

Yes! Go to the Add-ons Manager (Tools menu > Add-ons, or type about:addons into a new tab) and select Legacy Extensions. Click on “Find a Replacement” next to each legacy extension for a recommended alternative. You can read more about this feature in our blog.

You can also use the extension finder utility to look up the extension you would like to replace and discover recommended replacements. Compatible extensions can also be found on addons.mozilla.org. We recommend trying the featured collection.

There aren’t any recommended replacements for one of my legacy extensions. What now?

If you don’t find a suitable replacement, please head over to our forum to ask the community for suggestions.

How can I find extensions that are compatible with Firefox 57 and beyond?

You can search addons.mozilla.org for compatible extensions by using the search term “Firefox 57.” Our featured collection also includes great extensions that will be compatible beyond Firefox 57.

Why haven't some of the most popular tab extensions migrated?

While there are a number WebExtension APIs currently available for tabs, there are still more in development. In some cases, legacy tab extensions cannot migrate by the Firefox 57 release because they lack the necessary APIs to create feature parity. However, as more APIs become available over time, we should see the emergence of more and varied tab extensions. You can learn more about our plans for future tabs APIs on the Add-ons Blog and explore compatible tab extensions here.

Will my themes break with Firefox 57?

If you are using a Lightweight Theme, you should not experience any disruption. If you are using a Complete Theme, it will be disabled in Firefox 57 and will no longer work. If you use a dark complete theme, the Dark Theme option in the Add-on Manager might be a good option for you. Go to the Themes tab in about:addons and give it a try. We are making improvements to themes in the coming months, so look for themes with additional functionality beyond an image overlay in future releases.

What happened to my complete theme?

Complete themes do not work with Firefox 57 and are disabled. If you use a dark complete theme, the Dark Theme option in the Add-on Manager might be a good option for you. Go to the Themes tab in about:addons and give it a try. We are making improvements to themes in the coming months, so look for themes with additional functionality beyond an image overlay in future releases.

What happened to my Flash-related add-on?

Starting with the Firefox 55 release, Adobe Flash does not run by default as Click-to-run Flash is built into the browser. You can chose how you want Flash to behave on certain sites or all sites.

Some of the most popular Flash extensions were providing this capability before it became part of the browser. Since these extensions are now obsolete, they will likely no longer be supported by developers and will no longer work.

In some cases, we have WebExtension APIs for additional Flash capabilities (like Flash LSO deletion) and we anticipate add-ons will leverage more Flash capabilities over time and as we work together to discover what is needed to create feature parity.

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