--- a/browser/base/content/pageinfo/security.js
+++ b/browser/base/content/pageinfo/security.js
@@ -289,20 +289,17 @@ function securityOnLoad(uri, windowInfo)
 
 function setText(id, value) {
   var element = document.getElementById(id);
   if (!element)
     return;
   if (element.localName == "textbox" || element.localName == "label")
     element.value = value;
   else {
-    if (element.hasChildNodes())
-      element.firstChild.remove();
-    var textNode = document.createTextNode(value);
-    element.appendChild(textNode);
+    element.textContent = value;
   }
 }
 
 function viewCertHelper(parent, cert) {
   if (!cert)
     return;
 
   var cd = Cc[CERTIFICATEDIALOGS_CONTRACTID].getService(nsICertificateDialogs);