I lost my bookmarks when a new version of Firefox was installed. Please tell me what to do to get them back.
What about the rest of your profile? Settings, bookmarks, history, passwords . . . .
Look on your desktop. Do you see a folder called; Old Firefox? Look inside. Look for the folder with the latest creation date.
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.