LaurieEM said

I've lost my saved passwords

What about the rest of your profile? History, bookmarks, settings . . . .

Look on your desktop. Do you see a folder called; Old Firefox?

https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile

https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

In the event that the passwords information is lost, you should record all information in a separate text file somewhere else on your hard drive, or written down. You can easily copy and paste if you need to do so. If you are concerned about someone else looking at that file, you can compress it using a password.

Hi. Yes, there is a folder on the desktop marked "Old Firefox." And no - I did not lose my bookmarks, settings, or history. Just the saved passwords? Strange.

I've got my passwords saved elsewhere, safely - but the convenience of having them saved on FF is huge for me.

I did find these two folders in the desktop file:

logins.json logins.json.corrupt

???

Thank you for the speedy reply!

key3.db [v58+] key4.db and logins.json : These are the Password files. Both are required.

I have both in the folders, as well as logins.json.

Remove key4.db This may restore your passwords.

You can either try to delete key4.db and rename logins.json.corrupt to logins.json to see if that works with the present key3.db or delete key4.db and restore logins.json and key3.db from the "Old Firefox Data" folder on the desktop.