diff -r 000000000000 -r 6474c204b198 docshell/test/browser/browser_bug388121-2.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/test/browser/browser_bug388121-2.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,58 @@
+function test() {
+  waitForExplicitFinish(); 
+
+  var w;
+  const secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci.nsIScriptSecurityManager);
+  var iteration = 1;
+  const uris = ["", "about:blank"];
+  var uri;
+  var origDoc;
+
+  function testLoad() {
+    if (w.document == origDoc) {
+      // Go back to polling
+      setTimeout(testLoad, 10);
+      return;
+    }
+    var prin = w.document.nodePrincipal;
+    isnot(prin, null, "Loaded principal must not be null when adding " + uri);
+    isnot(prin, undefined, "Loaded principal must not be undefined when loading " + uri);
+    is(secMan.isSystemPrincipal(prin), false,
+       "Loaded principal must not be system when loading " + uri);
+    w.close();
+
+    if (iteration == uris.length) {
+      finish();
+    } else {
+      ++iteration;
+      doTest();
+    }
+  }
+
+  function doTest() {
+    uri = uris[iteration - 1];
+    w = window.open(uri, "_blank", "width=10,height=10");
+    var prin = w.document.nodePrincipal;
+    if (!uri) {
+      uri = undefined;
+    }
+    isnot(prin, null, "Forced principal must not be null when loading " + uri);
+    isnot(prin, undefined,
+          "Forced principal must not be undefined when loading " + uri);
+    is(secMan.isSystemPrincipal(prin), false,
+       "Forced principal must not be system when loading " + uri);
+    if (uri == undefined) {
+      // No actual load here, so just move along.
+      w.close();
+      ++iteration;
+      doTest();
+    } else {
+      origDoc = w.document;
+      // Need to poll, because load listeners on the content window won't
+      // survive the load.
+      setTimeout(testLoad, 10);
+    }
+  }
+
+  doTest();
+}