diff -r 000000000000 -r 6474c204b198 browser/base/content/pageinfo/feeds.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/pageinfo/feeds.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+XPCOMUtils.defineLazyModuleGetter(this, "Feeds",
+  "resource:///modules/Feeds.jsm");
+
+function initFeedTab()
+{
+  const feedTypes = {
+    "application/rss+xml": gBundle.getString("feedRss"),
+    "application/atom+xml": gBundle.getString("feedAtom"),
+    "text/xml": gBundle.getString("feedXML"),
+    "application/xml": gBundle.getString("feedXML"),
+    "application/rdf+xml": gBundle.getString("feedXML")
+  };
+
+  // get the feeds
+  var linkNodes = gDocument.getElementsByTagName("link");
+  var length = linkNodes.length;
+  for (var i = 0; i < length; i++) {
+    var link = linkNodes[i];
+    if (!link.href)
+      continue;
+
+    var rel = link.rel && link.rel.toLowerCase();
+    var rels = {};
+    if (rel) {
+      for each (let relVal in rel.split(/\s+/))
+        rels[relVal] = true;
+    }
+
+    if (rels.feed || (link.type && rels.alternate && !rels.stylesheet)) {
+      var type = Feeds.isValidFeed(link, gDocument.nodePrincipal, "feed" in rels);
+      if (type) {
+        type = feedTypes[type] || feedTypes["application/rss+xml"];
+        addRow(link.title, type, link.href);
+      }
+    }
+  }
+
+  var feedListbox = document.getElementById("feedListbox");
+  document.getElementById("feedTab").hidden = feedListbox.getRowCount() == 0;
+}
+
+function onSubscribeFeed()
+{
+  var listbox = document.getElementById("feedListbox");
+  openUILinkIn(listbox.selectedItem.getAttribute("feedURL"), "current",
+               { ignoreAlt: true });
+}
+
+function addRow(name, type, url)
+{
+  var item = document.createElement("richlistitem");
+  item.setAttribute("feed", "true");
+  item.setAttribute("name", name);
+  item.setAttribute("type", type);
+  item.setAttribute("feedURL", url);
+  document.getElementById("feedListbox").appendChild(item);
+}