With newer versions of firefox you can only temporarily load unpacked extensions. You need to re-add them if you relaunch firefox. https://blog.mozilla.org/add

With newer versions of firefox you can only temporarily load unpacked extensions. You need to re-add them if you relaunch firefox. https://blog.mozilla.org/addons/2018/02/22/removing-support-unpacked-extensions/ https://blog.mozilla.org/addons/2018/02/22/removing-support-...