Scroll down to the section on the extension page and click See all versions .
While Firefox usually installs extensions automatically from the Mozilla Add-ons Store (AMO) , you can manually save the XPI file for archival or offline use: : Navigate to the extension's page on Mozilla Add-ons. Right-click the Add to Firefox button. xpi download firefox
Locate the version you need and click the link to download its specific XPI file. Scroll down to the section on the extension