diff --git a/mozilla/browser/fuel/public/fuelIApplication.idl b/mozilla/browser/fuel/public/fuelIApplication.idl
index 899ea34741b..089fbf39e35 100644
--- a/mozilla/browser/fuel/public/fuelIApplication.idl
+++ b/mozilla/browser/fuel/public/fuelIApplication.idl
@@ -73,9 +73,9 @@ interface fuelIEventListener : nsISupports
 interface fuelIEvents : nsISupports
 {
   /**
-   * Adds an event listener to the list. If multiple identical event listeners
-   * are registered on the same event target with the same parameters the
-   * duplicate instances are discarded. They do not cause the EventListener
+   * Adds an event listener to the list. If multiple identical event listeners
+   * are registered on the same event target with the same parameters the
+   * duplicate instances are discarded. They do not cause the EventListener
    * to be called twice and since they are discarded they do not need to be
    * removed with the removeListener method.
    *
@@ -199,7 +199,7 @@ interface fuelIPreference : nsISupports
   /**
    * Check if a preference has been modified by the user, or not.
    */
-  attribute boolean modified;
+  readonly attribute boolean modified;
   
   /**
    * The preference branch that contains this preference.