Attaching my privacy and security setting's too .

Do you get a key icon at the left end of the location/address bar when you fill a login form? *https://support.mozilla.org/kb/usernames-and-passwords-are-not-saved ---- It is possible that there is a problem with the logins.json (encrypted names and passwords) and key3.db (encryption key and master password) files that store password data in Firefox. You can open the logins.json file in the Scratchpad (Firefox/Tools > Web Developer) to check its content. Click the "Pretty Print" button to format the file for readability. If there are names and encrypted passwords in logins.json then there is likely a problem with the key3.db file that stores the encryption key. You can rename the key3.db file (key3.db.old) and logins.json file (logins.json.old) or move these files to another folder to make it possible to undo the action. Rename/move a possible signons.sqlite file (signons.sqlite.old) used by older Firefox versions. You need to set a new Master Password after renaming or deleting key3.db and all currently saved passwords are lost. If that has worked then you can remove the renamed files that are no longer needed. Otherwise you can rename the files to their previous names (key3.db and logins.json).