Your Firefox profile cannot be loaded. It may be missing or inaccessible.

When trying to install Firefox, I got:”Your Firefox profile cannot be loaded. It may be missing or inaccessible.”

1. Press  +R on the keyboard. A Run dialog will open.
2. In the Run dialog box, type in:
   firefox.exe -P
   Note: You can use -P, -p or -ProfileManager (any of them should work).
3. Click OK. The Firefox Profile Manager (Choose User Profile) window should open.

Mine had two default users, one named default and the second named default with a string of numbers. The first was automatically selected so I selected the second and hit ok