I have Mac OS Mavericks 10.9
I attempted to run Firefox, and I got the error "Your Firefox profile cannot be loaded. It may be missing or inaccessible."
I read through the documentation, and I uninstalled Firefox, I also removed the profile. /Applications/ - deleted Firefox /Library - no firefox /Users/<username>/Library/Application Support/ - deleted Mozilla and Firefox folders
Then I downloaded Firefox25.dmg and installed it. I still get the same error. And there is no longer a Firefox or Mozilla folder under the Users/Library folder
I am using Chrome, as I can no longer use Firefox. So there is no troubleshooting information.
Solved! Go to Solution.
This happens when there is a profiles.ini file, but the default profiles listed in this file is missing.
You can use the Profile Manager to create a new profile.
See "Creating a profile":
If the new profile works then you can transfer some files from an existing profile (in case there is still one) to the new profile, but be cautious not to copy corrupted files to avoid carrying over the problem.
I'm sorry but this does not solve my issue.
There is No profile folder for the profile.ini. The ~/Library/Application Support/ folder does not contain Mozilla or Firefox.
Also, when I attempt to run the Profile Manager using the following command: /Applications/Firefox.app/Contents/MacOS/firefox -profilemanager
I still get the same error or Profile missing or inaccessible.
Note that the ~/Library is a hidden folder.
If you also get this error when you try to launch the Profile Manager via a terminal window then that would indicate that Firefox is running some how and you may need to check that in the process monitor or reboot the computer.