Product Information
What is Classic add-ons archive?
The Classic Add-Ons Archive directory 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 dismantle the classic extension ecosystem in favor of WebExtensions exclusively.
All data included in this archive has been sourced from publicly available repositories such as AMO, the Wayback Machine, and other open internet directories and collections. Cloud storage is provided by the WaterFox project.
This add-on has been tested with the following browsers (listed alphabetically): Basilisk RC1+, Firefox ESR 45-52, Firefox 45-58B, Pale Moon 27+, SeaMonkey 2.40+, and Waterfox 55+. To install it on Firefox release or beta versions, you will need to disable the extension signature requirement. Multi-process mode (E10S) is not supported.
How to use Classic add-ons archive?
Classic Add-ons Archive is a directory of classic Firefox add-ons developed with XUL/XPCOM technology, preserving the rich extension ecosystem before Mozilla transitioned to WebExtensions.
Core Functions of Classic add-ons archive
Browser Extension
Legacy Firefox add-on
Legacy add-on support
Usage Scenarios of Classic add-ons archive
- Find and Browse Classic Firefox Add-Ons Developed Before the WebExtensions Era.
- Install These Classic Add-Ons in Browsers Supporting XUL/XPCOM Technology (e.g., Pale Moon, Waterfox, Legacy Firefox).
- Access Historical Versions of Firefox Add-Ons for Research or Nostalgia.
- Restore the Use of Legacy Add-Ons on Specific Browser Versions (e.g., Firefox ESR 45-52).
Common Questions about Classic add-ons archive
What does the Classic Add-ons Archive do?
How do I use the Classic Add-ons Archive?
What are the core features of the Classic Add-ons Archive?
What are the application scenarios for the Classic Add-ons Archive?
