Hi all!
I was very unhappy to get new versions of FastDial with limited functional, so my pages looks ugly....
So i created nice and fast solution for removed favicons (without using Mozilla developers new API functions)!

You just need to replace few strings on file \Data\profile\extensions\fastdial@telega.phpnet.us\chrome\content\thumbnail\thumbnail.js:

this.getFavicon = function() {
    ...
    ...
    };

to those one:

this.getFavicon = function() {
	var url = this.getURL();
	if (this.properties.isFolder) {
		src = "chrome://fastdial/skin/icons/folder.png"
		} else {
			src = "http://www.google.com/s2/favicons?domain=" + url;
		}
	return src;

And of course in \Data\profile\extensions\fastdial@telega.phpnet.us\chrome\content\template\fastdial.tpl insert somewhere image tag:
<img src="<%= thumbnail.getFavicon() %>">

Good luck!
I hope it can be done in new version....