Normally, your bookmarks are stored ONLY locally on your hard drive. Did they extract any data from under the C:\Users\''username''\AppData\Roaming\Mozilla\Firefox\Profiles path? AppData is a hidden folder, so if you have a copy of that part of the old drive, set windows to show hidden files and folders in order to explore it: https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files Otherwise... If you created a Firefox account and used the Sync service to share your bookmarks with another computer, then often you can join a new installation of Firefox to that account to pick up that data. But it sounds as though you might not have done that.