diff --git a/dom/nfc/gonk/Nfc.js b/dom/nfc/gonk/Nfc.js
index 71a7123bc00..64cf0095ade 100644
--- a/dom/nfc/gonk/Nfc.js
+++ b/dom/nfc/gonk/Nfc.js
@@ -397,7 +397,7 @@ Nfc.prototype = {
 
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIObserver, Ci.nsINfcGonkEventListener]),
 
-  rfState: null,
+  rfState: NFC.NFC_RF_STATE_IDLE,
 
   nfcService: null,
 
diff --git a/dom/nfc/nsNfc.js b/dom/nfc/nsNfc.js
index 8d1b53e57bc..530bf9fa1d4 100644
--- a/dom/nfc/nsNfc.js
+++ b/dom/nfc/nsNfc.js
@@ -246,6 +246,13 @@ MozNFCPeerImpl.prototype = {
                                          Ci.nsIDOMGlobalPropertyInitializer]),
 };
 
+// Should be mapped to the RFState defined in WebIDL.
+let RFState = {
+  IDLE: "idle",
+  LISTEN: "listen",
+  DISCOVERY: "discovery"
+};
+
 /**
  * Implementation of navigator NFC object.
  */
@@ -270,13 +277,6 @@ MozNFCImpl.prototype = {
   nfcTag: null,
   eventService: null,
 
-  // Should be mapped to the RFState defined in WebIDL.
-  rfState: {
-    IDLE: "idle",
-    LISTEN: "listen",
-    DISCOVERY: "discovery"
-  },
-
   init: function init(aWindow) {
     debug("MozNFCImpl init called");
     this._window = aWindow;
@@ -316,22 +316,26 @@ MozNFCImpl.prototype = {
 
   startPoll: function startPoll() {
     let callback = new NfcCallback(this._window);
-    this._nfcContentHelper.changeRFState(this.rfState.DISCOVERY, callback);
+    this._nfcContentHelper.changeRFState(RFState.DISCOVERY, callback);
     return callback.promise;
   },
 
   stopPoll: function stopPoll() {
     let callback = new NfcCallback(this._window);
-    this._nfcContentHelper.changeRFState(this.rfState.LISTEN, callback);
+    this._nfcContentHelper.changeRFState(RFState.LISTEN, callback);
     return callback.promise;
   },
 
   powerOff: function powerOff() {
     let callback = new NfcCallback(this._window);
-    this._nfcContentHelper.changeRFState(this.rfState.IDLE, callback);
+    this._nfcContentHelper.changeRFState(RFState.IDLE, callback);
     return callback.promise;
   },
 
+  get enabled() {
+    return this._rfState != RFState.IDLE;
+  },
+
   defineEventHandlerGetterSetter: function defineEventHandlerGetterSetter(name) {
     Object.defineProperty(this, name, {
       get: function get() {
diff --git a/dom/webidl/MozNFC.webidl b/dom/webidl/MozNFC.webidl
index 26a9882060a..5db6ef8c65a 100644
--- a/dom/webidl/MozNFC.webidl
+++ b/dom/webidl/MozNFC.webidl
@@ -75,6 +75,11 @@ interface MozNFCManager {
  CheckPermissions="nfc nfc-share",
  AvailableIn="PrivilegedApps"]
 interface MozNFC : EventTarget {
+  /**
+   * Indicate if NFC is enabled.
+   */
+  readonly attribute boolean enabled;
+
   /**
    * This event will be fired when another NFCPeer is detected, and user confirms
    * to share data to the NFCPeer object by calling mozNFC.notifyUserAcceptedP2P.