diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_subframe_favicons_not_used.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_subframe_favicons_not_used.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,20 @@
+/* Make sure <link rel="..."> isn't respected in sub-frames. */
+
+function test() {
+  waitForExplicitFinish();
+
+  let testPath = getRootDirectory(gTestPath);
+
+  let tab = gBrowser.addTab(testPath + "file_bug970276_popup1.html");
+
+  tab.linkedBrowser.addEventListener("load", function() {
+    tab.linkedBrowser.removeEventListener("load", arguments.callee, true);
+
+    let expectedIcon = testPath + "file_bug970276_favicon1.ico";
+    is(gBrowser.getIcon(tab), expectedIcon, "Correct icon.");
+
+    gBrowser.removeTab(tab);
+
+    finish();
+  }, true);
+}