Hi Jeff, what is the current status of your old device where the data originated? You might want to make a physical backup from disk before restarting that Firefox is your Sync account is going to clear data. To access your Firefox profile folder on disk on Windows, it helps to set Windows to show hidden files and folder: https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files Then try submitting this shortcut path into the Windows system search box (on the Taskbar, Start menu) or Run dialog (Windows key + R): %APPDATA%\Mozilla\Firefox\Profiles You may have a .default or .default-release or other folders here. You can make a backup copy of the one that was most recently updated, judging from the Modified Date/Time on important files like '''places.sqlite''' (the database file that stores bookmarks and history). You also can grab the files from the '''bookmarkbackups''' subfolder to use in a Restore on another Windows installation of Firefox.