Fix more bustage from bug 684821

a=mcsmurf for checkin to a CLOSED TREE

suite/browser/nsTypeAheadFind.js

@@ -182,8 +182,8 @@ typeAheadFind.prototype = {
     // Don't start a find if the focus is an editable element.
     var window = aEvent.currentTarget;
     var element = window.document.commandDispatcher.focusedElement;
-    if (element instanceof Components.interfaces.nsIDOMNSHTMLElement &&
-        element.contentEditable == "true")
+    if (element instanceof Components.interfaces.nsIDOMHTMLElement &&
+        element.isContentEditable)
       return true;
 
     // Don't start a find if the focus is on a form element.

suite/common/nsContextMenu.js

@@ -1307,7 +1307,7 @@ nsContextMenu.prototype = {
       return true;
 
     for (var node = this.target; node; node = node.parentNode)
-      if (node instanceof Components.interfaces.nsIDOMNSHTMLElement)
+      if (node instanceof Components.interfaces.nsIDOMHTMLElement)
         return node.isContentEditable;
     return false;
   },