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.

What about the rest of your settings? Any changes?

Are you using any password add-ons of any kind?

Start Firefox in Safe Mode {web link} by holding down the <Shift> (Mac=Options) key, and then starting Firefox.

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

You can check in Windows Explorer if there is a previous version of the logins.json and key3.db files available.

• right-click: Properties -> Previous Versions
• http://windows.microsoft.com/en-US/windows7/Previous-versions-of-files-frequently-asked-questions
• http://windows.microsoft.com/en-US/windows-vista/Previous-versions-of-files-frequently-asked-questions
• http://windows.microsoft.com/en-us/windows-8/how-use-file-history

Do you have an "Old Firefox Data" folder on the desktop in case the Refresh feature in Firefox has been used and a new profile has been created?

• https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems

When you use the refresh feature in Firefox then a new profile is created and some personal data (bookmarks and history, form data, tabs) is automatically imported. The current profile folder will be moved to an "Old Firefox Data" folder on the desktop. Installed extensions and other customizations (toolbars, prefs) that you have made are lost and need to be redone.

It is possible to recover data from the "Old Firefox Data" folder on the desktop, but be cautious not to copy corrupted files to avoid carrying over problems.

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