diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug550565.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug550565.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+function test() {
+  waitForExplicitFinish();
+
+  let testPath = getRootDirectory(gTestPath);
+
+  let tab = gBrowser.addTab(testPath + "file_bug550565_popup.html");
+
+  tab.linkedBrowser.addEventListener("DOMContentLoaded", function() {
+    tab.linkedBrowser.removeEventListener("DOMContentLoaded", arguments.callee, true);
+
+    let expectedIcon = testPath + "file_bug550565_favicon.ico";
+
+    is(gBrowser.getIcon(tab), expectedIcon, "Correct icon before pushState.");
+    tab.linkedBrowser.contentWindow.history.pushState("page2", "page2", "page2");
+    is(gBrowser.getIcon(tab), expectedIcon, "Correct icon after pushState.");
+
+    gBrowser.removeTab(tab);
+
+    finish();
+  }, true);
+}