Is it two Firefox programs installed, or do you have two profiles? https://support&#46;mozilla&#46;org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible http://kb&#46;mozillazine&#46;org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder https://support&#46;mozilla&#46;org/en-US/kb/profile-manager-create-and-remove-firefox-profiles https://support&#46;mozilla&#46;org/en-US/kb/back-and-restore-information-firefox-profiles Type '''about:profiles'''<enter> in the address bar&#46; How many profiles are listed? How many should be there? Also, open the profile folder in your file explorer&#46;