Hello,

Please check out this article for more information about profiles. https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

A likely cause is a problem with the profiles.ini file and the profile marked as Default=1 in this file is no longer present on the hard drive.

• /Users/<user>/Library/Application Support/Firefox/
• http://kb.mozillazine.org/profiles.ini_file

You can use one of these to make Firefox create/use a new default profile:

• Delete the profiles.ini file to force Firefox to create a new default profile
• Use the Profile Manager to create a new profile
• Use "Choose Folder" when you create a new profile to select the location of a lost profile and recover this profile

• http://kb.mozillazine.org/Profile_Manager
• https://support.mozilla.org/kb/Managing+profiles
• http://kb.mozillazine.org/Profile_folder_-_Firefox

thanks, but i'm running on mac os x and don't have library, so i don't know how to find that. The only thing i can find is what there is on the picture. And when i try to find profile manager in Terminal i just get what is on the second picture.

I'm not sure if you even looked at the link I gave you? It clearly gives you instructions as for where to find the Library folder on OS X.

In Mac OS X v10.7 and later, the ~/Library folder is a hidden folder.

• http://kb.mozillazine.org/Show_hidden_files_and_folders#Mac_OS_X

thank you for your help, the problem is fixed:) when i finally found library i deleted the cached folder and made a new one, that worked.