InformationThe local-settings.js file is used by Firefox to reference and load the mozilla.cfg file which contains all the locked preferences.
Loading a custom configuration file is a primary mechanism for setting and enforcing security requirements within Firefox.
SolutionPerform the following procedure:
* Navigate to the defaults/pref directory inside the Firefox installation directory and create a file called local-settings.js.
* Include the following lines in local-settings.js: