Mozilla Addons

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Mozilla Addons
Mozilla Addons logo
Amo screenshot 2018-08-22.png
Project status Special case
Archiving status Not saved yet
Project source Unknown
Project tracker Unknown
IRC channel #outofammo (on EFnet)
Project lead Unknown

Mozilla Addons, also known as AMO (from its domain,, is a website run by the Mozilla Foundation which hosts extensions and themes for Firefox, Thunderbird, and other Mozilla software.

Extensions used to be based on XPI until the introduction of WebExtensions around 2016. Since Firefox 57 and Thunderbird 58, only WebExtensions are supported. XPI-based addons (called "legacy") are deprecated but still supported until the end-of-life of Firefox 52 ESR in September 2018. The legacy addons will be removed from AMO in early October 2018[1][2].