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Firefox did a mystery update. I have lost all my usernames/passwords. The current fix here listed does not work (the property does not exist in about:config).

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I have no real other details to add. My version was updated against my wishes and destruction of profile data wasn't cool.

I have no real other details to add. My version was updated against my wishes and destruction of profile data wasn't cool.

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Did Firefox perform a Refresh? Please check your desktop for a folder named Old Firefox Data that we might be able to use for recovery.

Also, just to confirm, did you use Firefox's built-in Password Manager feature to store your passwords, or an add-on? If a password-related add-on stopped working in Firefox 40, it might need an update. The details depend on which program it is.