content/base/test/file_mixed_content_frameNavigation_blankTarget.html

<!DOCTYPE HTML>
<html>
<!--
Tests for Mixed Content Blocker - Opening link with _blank target in an https iframe.
https://bugzilla.mozilla.org/show_bug.cgi?id=841850
-->
<head>
  <meta charset="utf-8">
  <title>Tests for Mixed Content Frame Navigation</title>
</head>
<body>
<a href="http://example.com/tests/content/base/test/file_mixed_content_frameNavigation_innermost.html?blankTarget" id="blankTarget" target="_blank">Go to http site</a>

<script>
  var blankTarget = document.getElementById("blankTarget");
  blankTarget.click();

  var os = SpecialPowers.Cc["@mozilla.org/observer-service;1"].
     getService(SpecialPowers.Components.interfaces.nsIObserverService);
  var observer = {
    observe: function(subject, topic, data) {
      if(topic == "content-document-global-created" && data =="http://example.com") {
         parent.parent.postMessage({"test": "blankTarget", "msg": "opened an http link with target=_blank from a secure page"}, "http://mochi.test:8888");
         os.removeObserver(observer, "content-document-global-created");
      }
    }
  }
  os.addObserver(observer, "content-document-global-created", false);

</script>
</body>
</html>