diff -r 000000000000 -r 6474c204b198 browser/base/content/test/general/browser_bug520538.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/base/content/test/general/browser_bug520538.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,15 @@
+function test() {
+  var tabCount = gBrowser.tabs.length;
+  gBrowser.selectedBrowser.focus();
+  browserDOMWindow.openURI(makeURI("about:blank"),
+                           null,
+                           Ci.nsIBrowserDOMWindow.OPEN_NEWTAB,
+                           Ci.nsIBrowserDOMWindow.OPEN_EXTERNAL);
+  is(gBrowser.tabs.length, tabCount + 1,
+     "'-new-tab about:blank' opens a new tab");
+  is(gBrowser.selectedTab, gBrowser.tabs[tabCount],
+     "'-new-tab about:blank' selects the new tab");
+  is(document.activeElement, gURLBar.inputField,
+     "'-new-tab about:blank' focuses the location bar");
+  gBrowser.removeCurrentTab();
+}