--- a/dom/webidl/Navigator.webidl
+++ b/dom/webidl/Navigator.webidl
@@ -211,23 +211,23 @@ partial interface Navigator {
 
   // WebKit/Blink/Trident/Presto support this.
   [Throws]
   boolean javaEnabled();
 
   /**
    * Navigator requests to add an idle observer to the existing window.
    */
-  [Throws, CheckAnyPermissions="idle"]
+  [Throws, ChromeOnly]
   void addIdleObserver(MozIdleObserver aIdleObserver);
 
   /**
    * Navigator requests to remove an idle observer from the existing window.
    */
-  [Throws, CheckAnyPermissions="idle"]
+  [Throws, ChromeOnly]
   void removeIdleObserver(MozIdleObserver aIdleObserver);
 
   /**
    * Request a wake lock for a resource.
    *
    * A page holds a wake lock to request that a resource not be turned
    * off (or otherwise made unavailable).
    *