diff --git a/mozilla/extensions/venkman/resources/content/tests/tree.js b/mozilla/extensions/venkman/resources/content/tests/tree.js
index 8587147c118..78ecd81ed32 100644
--- a/mozilla/extensions/venkman/resources/content/tests/tree.js
+++ b/mozilla/extensions/venkman/resources/content/tests/tree.js
@@ -99,7 +99,7 @@ function formatBranch (rec, indent)
     for (var i = 0; i < rec.childData.length; ++i)
     {
         formatRecord (rec.childData[i], indent);
-        if (rec.childData[i].childData)
+        if ("childData" in rec.childData[i])
             formatBranch(rec.childData[i], indent + "  ");
     }
 }
diff --git a/mozilla/extensions/venkman/resources/content/tests/tree.xul b/mozilla/extensions/venkman/resources/content/tests/tree.xul
index 4959edfba48..9ff0c1300a4 100644
--- a/mozilla/extensions/venkman/resources/content/tests/tree.xul
+++ b/mozilla/extensions/venkman/resources/content/tests/tree.xul
@@ -15,7 +15,7 @@
     <script>
       <![CDATA[
         dd = function (msg) { dump("-*- tree: " + msg + "\n"); }
-        ASSERT = function (expr, msg) {
+        var ASSERT = function (expr, msg) {
             if (!expr)
                 dd ("** ASSERTION FAILED: " + msg + " **\n" + getStackTrace()); 
         }