I wrote a Firefox add-in to to be deployed by an external Windows application. Up to now, the application has deployed the add-on by copying it into the active profile. With compulsory add-on signing, I rebuilt my add-on with jpm and had it signed by Mozilla. It is now a valid add-on that I can install as a Firefox user. However, dropping the add-on into the Extensions directory of the profile no longer results in it being installed and enabled when Firefox restarts. I have looked at as many articles and forum posts as I can find, but most of them are out of date. I assume that something has changed in recent versions of Firefox that prevents deployment by this method. What I require is a way of delivering the add-on without inconveniencing users. I am not particularly interested in users in removing the add-on as it is designed to be helpful! Could somebody point me to the information on how to do this with Firefox 45?