How to Create a New Profile in Mozilla Firefox Browser? Close Mozilla Firefox Browser if it is open. Click ‘File’ and then ‘Exit’ to Make Sure the Program is Completely Closed. Click ‘Start’ Menu From the Desktop.’ Type ‘Firefox.exe -ProfileManager’ in the ‘Open’ text field. Hit ‘Enter’ to Launch the Profile Manager. Click the ‘Create Profile’ button to begin Using the Profile Creation Wizard. Click ‘Next’ after Reading the Welcome Message. Type a Profile Name in the Space Provided. Consider Using Something Descriptive to Help you Remember What is Saved in the Profile. Click the ‘Finish’ Button to Complete the Wizard. New Profile is Now Created in Mozilla Firefox Browser. This is How You Can Create New Profile in Mozilla Firefox.