hello.... '''To restore this data:''' On the desktop you should see a folder called ''''Old Firefox Data'''' open it and '''copy all the data by highlighting and selecting everything in that folder, then right click and select copy.''' Now open FIrefox. Head on over to '''about:profiles''' by typing it in your URL bar. Click on the '''Open Folder button under the Local Directory, not root. Then right click when inside the new profile folder and select paste. ''''''Then restart Firefox.''' You should now have all your previous bookmarks, and data back. If this solved your problem, mark as solution. thank you