Such an Old Firefox Data folder on the desktop gets created when you reset Firefox.<br /> If you reset Firefox then Firefox should have automatically imported your data like bookmarks, history, cookies, passwords, form data. Hasn't this happened in your case?<br /> What kind of problems did you have that you reset Firefox? ---- You need to copy the two files signons.sqlite and key3.db (encryption key; master password) to the current Firefox profile folder to move over the names and passwords.<br /> For the bookmarks you can either copy the places.sqlite file or use one of the JSON backups in the bookmarkbackups folder. *http://kb.mozillazine.org/Backing_up_and_restoring_bookmarks_-_Firefox See also: *https://support.mozilla.org/kb/Recovering+important+data+from+an+old+profile *http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox You can use this button to go to the Firefox profile folder: *Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)