If you are Firefox user , you might be using addons/themes to enhance your features.
Now what would you do if you are about to format your PC and reinstall Firefox and other softwares ??.Most probably you will download addons and themes again !! . Here is an alternate solution for this problem . It is just another Firefox addon called CLEO or Compact Library Extension Organizer.

CLEO can combine all Firefox addons/themes to a  single installer .

That is , we can combine all our Firefox themes and addons into a compact XPI file andbackup for future use.