https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Did you somehow remove the Firefox profile folder? *~/Library/Application Support/Firefox/Profiles/&lt;profile&gt;/ This happens when Firefox can't find the profile that is marked as "Default=1" in the profiles.ini file. This can also be a problem with permissions/ownership of involved folders/files that is preventing access. See: *https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible <hr> You can try these steps to get a new profile: *delete the profiles.ini file to make Firefox create a new (default) profile *use the Profile Manager to create a new profile<br>https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles *register an orphaned profile that isn't listed in the Profile Manager You can find the profiles.ini file in this hidden location: *Mac: ~/Library/Application Support/Firefox/ You can recover an orphaned profile via these steps: *use the Profile Manager to create a new profile<br>https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles *click "Choose Folder" in the Profile Manager *browse to the location of this profile to register this profile in the Profile Manager and use this profile See "Profile was moved or renamed": *https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible Note that you should never use "Choose Folder" to specify a folder that already contains files that do not belong to Firefox. Only use "Choose Folder" to recover an profile that isn't listed in the Profile Manager. If this didn't work then check the read/write permissions and owner or remove the Mozilla/Firefox folder in both main/root and cache locations. Location of the cache files. *Mac: ~/Library/Caches/Firefox/Profiles/ <hr> *http://kb.mozillazine.org/profiles.ini_file *https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles *https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

problem solved. You were both most helpful. Thanks

Again, all resolved quickly and simply. Thanks to both of you. /s/ Edgar D. Aronson