Userscripts.org

var Favicons = {
UNFIXED_ICON_XPATH: '//span[contains(@class,"icon sub-icon")][not(@label)]',
EXPORT_URL: '/reader/subscriptions/export',
FAVICON_URL: ['http://', '/favicon.ico'],

PARSE_DOMAIN: /:\/\/([\w\.]+)/,

domains: {},
cacheIcons: {},

loadDomains: function () {
var xhr = new XMLHttpRequest();
xhr.open('get', this.EXPORT_URL, true);
xhr.onload = function(){
Favicons.setDomains(xhr.responseXML);
};
xhr.send('');
},

parseDomain: function(url) {
var match = this.PARSE_DOMAIN.exec(url);
return match && match[1];
},

setDomains: function (opmlDoc) {
var outline, i = 0,
outlines = opmlDoc.getElementsByTagName('outline');

while (outline = outlines[i++]) {
if (! outline.hasAttribute('htmlUrl')) continue;
var title = outline.getAttribute('title');

if (title.length > 24)
title = title.substr(0, 21) + '...';

this.domains[title] =
this.parseDomain(outline.getAttribute('htmlUrl'))
|| this.parseDomain(outline.getAttribute('xmlUrl'));
}
setInterval(function () {
Favicons.fixAllIcons();
}, 2000);
},

fixAllIcons: function () {
var icon, i = 0, label;
var uncorrectedIcons = document.evaluate(this.UNFIXED_ICON_XPATH, document, null, 6, null);
while (icon = uncorrectedIcons.snapshotItem(i++)) {
label = icon.nextSibling.firstChild.textContent;
var urlIcon = this.FAVICON_URL.join(this.domains[label]);
var img = document.createElement('img');
icon.appendChild(img);
icon.setAttribute('label', label);
img.setAttribute('style', 'display:none');
img.src = urlIcon;

img.addEventListener("error", function(e){
e.target.parentNode.removeChild(e.target);
}, false);

img.addEventListener("load", function(e){
var FAVICON_STYLE= ['background: url(', ');'];
e.target.parentNode.setAttribute('style', FAVICON_STYLE.join(e.target.src));
e.target.parentNode.removeChild(e.target);
}, false);

}
}
};

Favicons.loadDomains();