C:\Windows.old

When you do an upgrade, there are a few different choices, and some of them may require you to dig out your old Firefox data. Did any of your Firefox data carry over -- preferences like home page, saved passwords, etc.? If nothing carried over, you can look for your old settings folder in another place. Can you find this folder on your system: C:\Windows.old If so, can you find this folder: C:\Windows.old\Users\''your-user-name'' If so, your old Firefox data may well be in there. To explore further, it would be helpful to set Windows to show hidden files and folders. This article has the steps: http://windows.microsoft.com/en-us/windows/show-hidden-files Then look for: C:\Windows.old\Users\''your-user-name''\AppData\Roaming\Mozilla\Firefox\Profiles Here you may find one or more semi-randomly named folders. The one with the most recently updated contents probably is the one you want to restore from. '''''Bookmarks Only''''' Drill down into the old '''bookmarkbackups''' folder and copy the two most recent backups to a convenient location such as the desktop. The Restore feature will replace the default Firefox bookmarks (and anything you just added since the Reset) with the older set of bookmarks. If you need to preserve newly added bookmarks, use the export feature first, before the Restore, and then the Import feature afterwards. The following articles have the details: * (Optional) [[Export Firefox bookmarks to an HTML file to back up or transfer bookmarks]] * [[Restore bookmarks from backup or move them to another computer]] -- to access the backups on the desktop, use the "Choose file" command on the menu * (Optional) [[Import Bookmarks from an HTML file]] Success? '''''Complete Restoration''''' This post has my suggested procedure for resurrecting your entire old profile in your new installation of Firefox. Please note the use of ''copy'' instead of ''move'' throughout the process. This allows you to try again if it fails somewhere along the way. https://support.mozilla.org/questions/1024189#answer-638319 Any luck?