The Firefox Environment Backup Extension (FEBE) is an absolute must-have add-on for all Mozilla Firefox users. This extremely useful extension enables users to create scheduled backups of all things Firefox – themes, extensions, plug-ins, passwords, histories, etc.
FEBE takes things one step further with the Compact Library Extension Organizer (CLEO). This additional extension allows users to create custom Firefox add-on packs by merging multiple extensions and themes into one installable file.
Bottom line – FEBE+CLEO makes new and re-installations of FF a snap.