I updated Firefox and now the Saved Logins is empty and it won't save new logins and passwords from any website.
I update Firefox a few days ago. Now Saved Logins is completely empty. And when I'm prompted to save a new login and password from any website I click "save" but then I check the Saved Logins and it remains empty. And yes, I have clicked the checkbox for "Remember logins and passwords for websites".
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Firefox 58+ versions have switched to key4.db (SQLite) and no longer use key3.db (DBM) for the key file that stores the encryption key for logins.json, but can fallback to key3.db if you remove key4.db. It is possible that something went wrong with the migration from key3.db to key4.db. If you have key3.db in the profile folder then remove the current key4.db file to see if the migrations works better this time. If you have logins.json.corrupt then rename this file to logins.json. Make sure to keep a backup of all involved files (logins.json and key3.db and key4.db). You need to make sure Firefox is closed when you make modifications to files in the profile folder. Because Firefox 58+ uses key4.db instead of key3.db the password files are no longer backwards compatible.
You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.
- Help -> Troubleshooting Information -> Profile Directory:
Windows: Show Folder; Linux: Open Directory; Mac: Show in Finder - http://kb.mozillazine.org/Profile_folder_-_Firefox