--- a/dom/plugins/test/mochitest/pluginstream.js
+++ b/dom/plugins/test/mochitest/pluginstream.js
@@ -1,20 +1,13 @@
   SimpleTest.waitForExplicitFinish();
 
   function frameLoaded(finishWhenCalled = true, lastObject = false) {
     var testframe = document.getElementById('testframe');
-    function getNode(list) {
-      if (list.length === 0)
-        return undefined;
-      return lastObject ? list[list.length - 1] : list[0];
-    }
-    var embed = getNode(document.getElementsByTagName('embed'));
-    if (undefined === embed)
-      embed = getNode(document.getElementsByTagName('object'));
+    var embed = getEmbed(lastObject);
 
     // In the file:// URI case, this ends up being cross-origin.
     // Skip these checks in that case.
     if (testframe.contentDocument) {
       var content = testframe.contentDocument.body.innerHTML;
       if (!content.length)
         return;
 
@@ -32,8 +25,20 @@
          "content doesn't match");
     }
 
     is(embed.getError(), "pass", "plugin reported error");
     if (finishWhenCalled) {
       SimpleTest.finish();
     }
   }
+
+  function getEmbed(lastObject = false) {
+    function getNode(list) {
+      if (list.length === 0)
+        return undefined;
+      return lastObject ? list[list.length - 1] : list[0];
+    }
+    var embed = getNode(document.getElementsByTagName('embed'));
+    if (undefined === embed)
+      embed = getNode(document.getElementsByTagName('object'));
+    return embed;
+  }