It is possible that there is a problem with the files key3.db and signons.sqlite that store the encrypted names and passwords in Firefox.<br /> Rename the files key3.db and signons.sqlite in the Firefox profile folder.<br /> You can add .old to the file names (key3.db.old and signons.sqlite.old) or move them to another folder to make it possible to undo the action.<br /> You need to set a new Master Password after renaming or deleting key3.db and all currently saved passwords are lost.<br /> If that has worked then you can remove the renamed files that are no longer needed. See: * "Troubleshooting" in http://kb.mozillazine.org/Password_Manager * http://kb.mozillazine.org/Profile_folder_-_Firefox. You can use this button to go to the Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Open Containing Folder