Firefox browser forum doesn't advise on Addon development. You could contact Firefox Development. https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/Contact_us

Hi Once way to do this would be to keep a separate backup of your add-ons and reinstall them as a folder. This support article gives a high level overview of this: https://support.mozilla.org/en-US/kb/deploying-firefox-with-extensions That said, there is a risk that add-ons miss important updates. It would be better to take a backup of your Firefox Profile to capture not only add-ons but also your bookmarks, passwords a dn other browsing data and retinstall that. This article will help: https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles