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Catalog of classic Firefox add-ons created before WebExtensions apocalypse
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Classic Add-ons Archive


This catalog contains 93,598 versions of 19,450 Firefox add-ons created by 14,274 developers over the past 15 years using XUL/XPCOM technology before Mozilla decided to ruin the classic extensions ecosystem and go exclusively to WebExtensions.

Who creates these add-ons?

The add-ons listed here have been created by a wide range of developers from individual hobbyists to large corporations and were reviewed by a team of AMO editors before being released. Add-ons marked as Experimental have not been reviewed and should be installed with caution.

The source of data

All the data contained in this catalog was obtained from publicly available sources such as AMO, Wayback Machine and other open Internet directories and collections. Cloud storage is kindly provided by Waterfox Project.

Legal notices

Except as noted below, this catalog is released under Mozilla Public License, version 2.0. The design is based on AMO website by Mozilla and adapted by JustOff under CC-BY-SA-3.0. All product names, logos and brands are property of their respective owners, specific licenses are indicated in the description of each add-on. All company, product and service names used in this catalog are for identification purposes only.

Compatibility and installation

This add-on has been tested with the following browsers (in alphabetical order): Basilisk RC1+, Firefox ESR 45-52, Firefox 45-58b, Pale Moon 27+, SeaMonkey 2.40+ and Waterfox 55+. In order to install it into Firefox release or beta, you need to disable the extensions signing requirement. Multi-process mode (e10s) is not supported. The installation package is located in the releases section.

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