Mozilla considered that the significant changes Debian had done to the browser were outside Mozilla 's policy boundaries , so Iceweasel was revived .
In 2006 , Mozilla withdrew their permission for Debian to use the Firefox name due to significant changes to the browser that Mozilla deemed outside the boundaries of it 's policy , changes which Debian felt were important enough to keep , and Iceweasel was revived in its place.
GNU IceCat