Firefox Extension Backup / CLEO is a combo pack of the Firefox Extension Backup Extension (FEBE) and CLEO (Compact Library Extension Organizer) that enables you to backup your Firefox extensions as well as bookmarks, preferences, cookies, passwords and more.CLEO allows you to combine your extensions into a single, installable .xpi file so you can store or distribute them easily. You can maintain multiple backup sets in folders named after the date of the backup, and easily restore any of the backup files.