--- a/dom/webidl/MozTetheringManager.webidl
+++ b/dom/webidl/MozTetheringManager.webidl
@@ -27,17 +27,17 @@ dictionary TetheringConfiguration {
   DOMString endIp;
   DOMString dns1;
   DOMString dns2;
   WifiTetheringConfig wifiConfig;
 };
 
 [JSImplementation="@mozilla.org/tetheringmanager;1",
  NavigatorProperty="mozTetheringManager",
- AvailableIn="CertifiedApps"]
+ ChromeOnly]
 interface MozTetheringManager {
   /**
    * Enable/Disable tethering.
    * @param enabled True to enable tethering, False to disable tethering.
    * @param type Tethering type to enable/disable.
    * @param config Configuration should have following fields when enable is True:
    *               - ip ip address.
    *               - prefix mask length.