--- a/mail/components/compose/content/addressingWidgetOverlay.js
+++ b/mail/components/compose/content/addressingWidgetOverlay.js
@@ -1044,17 +1044,17 @@ function awSizerMouseUp()
 {
   document.removeEventListener("mousemove", awSizerMouseMove, true);
   document.removeEventListener("mouseup", awSizerMouseUp, false);
 }
 
 function awDocumentKeyPress(event)
 {
   try {
-    var id = event.target.getAttribute('id');
+    var id = event.target.id;
     if (id.substr(0, 11) == 'addressCol1')
       awMenulistKeyPress(event, event.target);
   } catch (e) { }
 }
 
 function awRecipientInputCommand(event, inputElement)
 {
   gContentChanged=true;