'''https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles''' Use the Profile Manager to create and remove Firefox profiles Firefox stores your personal information and settings in a profile folder. Learn to use the Profile Manager to create, remove, rename, and switch profiles. Create a new profile. If it works, the old profile may be corrupted. '''https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile''' Recovering important data from an old profile If you've had to create a new Firefox profile, this article will explain how to recover information like bookmarks, history and passwords from an old one.

Hello dbmckeen, see : [https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible#firefox:mac:fx31 How to run Firefox when your profile is missing or inaccessible] thank you