Hello! Please take a look at the profile and bookmark data. If those still in your local files there might be a way to restore them. Please confirm if you have the files. Storage Locations by Operating System Windows: Firefox profile data is stored in two separate locations : Main profile (bookmarks, passwords, settings): C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Profiles\<profile_folder>\ Cache and temporary files: C:\Users\<username>\AppData\Local\Mozilla\Firefox\Profiles\<profile_folder>\ macOS: Profile data is located at ~/Library/Application Support/Firefox/Profiles/<profile_folder>/ Linux: Profile data is stored at ~/.mozilla/firefox/<profile_folder>/ Once you've identify that there is data to restore you can see Restore bookmarks, passwords, and data from an old Firefox profile