An error occurred while loading or saving configuration information for firefox. Some of your configuration settings may not work properly.
If you click on details of that error you may see:
Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See http://projects.gnome.org/gconf/ for information. (Details – 1: Server ping error: IDL:omg.org/CORBA/COMM_FAILURE:1.0)
The fix for this issue may be:
1. CTRL+ALT+Backspace to log out of the current desktop session.
2. Open a terminal. CTRL+ALT+F1
3. login as root
4. cd to /tmp/
5. rm -rf X0-lock
The cause may be that you deleted the contents, or some program or installer deleted the contents of your system’s tmp folder.