Hi, since you reset it there should be nothing on there to save. Please dump it in the trash after grabbing a new installer here please : *https://www.mozilla.org/firefox/all/

You can check if you have an "Old Firefox Data" folder on the desktop in case the Refresh feature in Firefox has been used and a new profile has been created. *https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems You would need the logins.json and key4.db files to recover the passwords. *https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile If you use the Time Machine or other backup then try to restore these two file(s) from this backup. *http://www.apple.com/support/timemachine/