Mozilla signon.txt file

Ive been searching for this file for quite a while, but never really discovered it until today, mozilla firefox has that option taht lets u save ur passwords for certain websites, and they save it into the file signon.txt, in your application data/mozilla, for windows, but anyways, some of the file is in plain text…like the websites, and it also says where the username and passwords are, but they are encryted, and i was wondering how its encrypted or if anyone has every decrypted it, i m using version 1.something, not completely sure, but could u guys please help

Fosco