--- a/dom/webidl/MozWifiManager.webidl
+++ b/dom/webidl/MozWifiManager.webidl
@@ -242,16 +242,24 @@ interface MozWifiManager : EventTarget {
    *            string as value.
    *            request.result[USAGE] = [CA_NICKNAME1, CA_NICKNAME2, ...]
    *            USAGE string includes: "ServerCert".
    * onerror: We have failed to list certificate.
    */
   DOMRequest getImportedCerts();
 
   /**
+   * Delete an imported certificate.
+   * @param certNickname Nickname of imported to be deleted.
+   * onsuccess: We have successfully deleted certificate.
+   * onerror: We have failed to delete certificate.
+   */
+  DOMRequest deleteCert(DOMString certNickname);
+
+  /**
    * Returns whether or not wifi is currently enabled.
    */
   readonly attribute boolean enabled;
 
   /**
    * Returns the MAC address of the wifi adapter.
    */
   readonly attribute DOMString macAddress;

--- a/dom/wifi/nsIWifiCertService.idl
+++ b/dom/wifi/nsIWifiCertService.idl
@@ -2,17 +2,17 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "nsISupports.idl"
 
 interface nsIDOMBlob;
 interface nsIWifiEventListener;
 
-[scriptable, uuid(49e8e04e-eb05-4c92-84a6-7af32310f0c3)]
+[scriptable, uuid(2712a791-f720-484d-8820-c4085629f657)]
 interface nsIWifiCertService : nsISupports
 {
   const unsigned short WIFI_CERT_USAGE_FLAG_SERVER = 0x01;
   const unsigned short WIFI_CERT_USAGE_FLAG_USER   = 0x02;
 
   void start(in nsIWifiEventListener listener);
   void shutdown();
 
@@ -27,9 +27,20 @@ interface nsIWifiCertService : nsISuppor
    *        Password of certificate.
    * @param certNickname
    *        User assigned nickname for imported certificate.
    */
   void importCert(in long id,
                   in nsIDOMBlob certBlob,
                   in DOMString certPassword,
                   in DOMString certNickname);
+
+  /**
+   * Delete an imported certificate file
+   *
+   * @param id
+   *        Request ID.
+   * @param certNickname
+   *        Certificate nickname to delete.
+   */
+  void deleteCert(in long id,
+                  in DOMString certNickname);
 };