diff --git a/common/content/util.js b/common/content/util.js
index 07dfc162..41c512cd 100644
--- a/common/content/util.js
+++ b/common/content/util.js
@@ -708,7 +708,7 @@ const Util = Module("util", {
         }
         switch (node.nodeKind()) {
         case "text":
-            return doc.createTextNode(node);
+            return doc.createTextNode(String(node));
         case "element":
             let domnode = doc.createElementNS(node.namespace(), node.localName());
             for each (let attr in node.@*)