Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.

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

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

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

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

Type about:profiles<enter> in the address bar. How many profiles are listed? How many should be there? Also, open the profile folder in your file explorer.

No there is nothing on my desktop called Old Firefox.

And my other post?

I'm lucky I had Youtube open in another firefox browser window which still had ALL my Bookmarks. When the browser updated it stated something to the effect that it was not secure to open in the current profile. Would I like to open in a new profile? You pretty much have no choice to start a new profile which starts a whole new profile with no bookmarks, saved passwords etc. I had to export from the old browser to the new one. It should not have done that. It should have just kept the current profile and not force a new one.

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. Your feedback gets collected by a team of people who read it and gather data about the most common issues.

Quote: When the browser updated it stated something to the effect that it was not secure to open in the current profile.

You get this warning message if you try to open a Firefox profile with a Firefox version that is older than the Firefox version that last used the profile (i.e. you intend to downgrade). There are workarounds available to bypass this, but it isn't recommended and should be used with a lot of care (i.e. there is a reason for this warning). Better is to create a new profile and transfer valuable data from the old profile to the new profile.

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