Coding question

A the moment Camino does not display all favicons, it only displays the /favicon.ico, if the site has one. I'm trying to understand how Seamonkey deals with entities such has link rel="icon", which it manipulates like favicons. I've been lxring a bit of the afternoon on how it was achieved. It seems that document.getElementById("page-proxy-favicon"); does the trick, but I can't use Js in camino. My guess is that the parser loads the image and stores it somewhere. If I'm right then I would "just" need to retrieve this image if it exist. If I'm wrong could someone point me to a hint on how the favicon mechanism work in Seamonkey/Firefox ?