There no such thing as 8.0. What are you referring to?

Note that this is likely about Firefox 58.0 with a missing leading '5'.

You can check if 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

If you have this folder on the desktop then try to recover logins.json and key3.db.

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

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

Otherwise you can check in Windows Explorer if there is a previous version of these files available.

• right-click: Properties -> Previous Versions
• https://support.microsoft.com/en-us/help/17128/windows-8-file-history

WestEnd said

There no such thing as 8.0.

Firefox 8.0 certainly existed back in 2011. I agree with cor-el that it was likely a typo on 58.0 and if you look at system details. https://www.mozilla.org/firefox/releases/

Hi Cor-el. I do have a folder "old firefox data" but it doesn't contain the two files you mention. I think I will just have to type in passwords as and when I need them. Thanks for your help.

sukisdad said

I think I will just have to type in passwords as and when I need them.

Maybe (just maybe) not necessary - another user reported that all he did was reboot his computer.

See his last post in this thread : https://support.mozilla.org/en-US/questions/1183565

Worth a try .......

Thanks, I reboot every day. Didn't solve the problem.

sukisdad said

Thanks, I reboot every day. Didn't solve the problem.

Bummer  !

How about the Refresh cor-el suggested - have you tried that  ?