I would like to store the password for a site as password manager does with "Remember Password" when we do a login. I'm planning to do it for automation purpose with below steps. 1. Load add-on when launching Firefox. This add-on will have a method to access Firefox Password Manager to store password. 2. Execute JavaScript that can call a method under add-on to store the password. Note: Second script will hold all information required to store password under password manager utility. Can anyone help me on getting the step one to be completed ?