For Debian Linux, I have a post-installation script in which I would like to make a few local settings for a newly created user account in the file ~/.mozilla/firefox/<profile-directory>/user.js. However, before the user has launched Firefox there is no ~/.mozilla directory. Knowing that the default profile directory name ends with .default-esr I tried creating a new profile with the command firefox -CreateProfile default-esr but when Firefox is launched it creates another profile directory which ends with .default-esr-1. How can I create local settings from a script (without user intervention) before Firefox has been launched? I run Debian 12.1 and Mozilla Firefox 102.13.0esr (from the standard repository).