I've done a clean install of Windows 7 to my laptop and so have of course lost my previous Firefox installation. I do have a sync account and have sync'd my bookmarks to my Android phone. I can't find an option in Firefox to sync bookmarks back to the computer from which the sync account originated. There is of course no sync account set up in the newly installed browser, and my only practical option is to create a new account. I am afraid to enter my current account information here, because I don't want to take the chance of having Sync overwrite my stored records with the pristine state of my newly installed browser. When I click the link for existing accounts, I'm directed to the "Add a Device" screen, but this screen presumes I'm sync'ing to a device other than the one I currently working on. I can't discern a way of adding my laptop as a "new" device.