Your Firefox bookmarks and other data could be found in your old Firefox profile folder. By default, Windows sets this as a hidden folder, so step 1 is to set Windows to show hidden files and folders. This article has the steps: http://windows.microsoft.com/en-us/windows/show-hidden-files Next, use the Windows search bar to look for all instances of '''bookmarks-2016*''' -- the automatic backup files Firefox creates every few days. This might be on your C drive or it might be on other media if that's how it was preserved. These files follow a naming pattern like: bookmarks-2016-03-10_750_''gibberish''.jsonlz4 In this example, the backup was made on March 10, 2016 and contains 750 bookmarks and bookmark folders. So you can get a sense of which one(s) look most promising. Note: Windows doesn't know how to open these files, so don't try that. Instead, you'll use the Restore procedure. See: [[Restore bookmarks from backup or move them to another computer]] Any luck?