diff --git a/content/base/src/nsGkAtomList.h b/content/base/src/nsGkAtomList.h
index 6d1fc188fdaf..331ffa1ee638 100644
--- a/content/base/src/nsGkAtomList.h
+++ b/content/base/src/nsGkAtomList.h
@@ -704,6 +704,7 @@ GK_ATOM(ondisabled, "ondisabled")
 GK_ATOM(ondischargingtimechange, "ondischargingtimechange")
 GK_ATOM(ondisconnected, "ondisconnected")
 GK_ATOM(ondisconnecting, "ondisconnecting")
+GK_ATOM(ondiscoverystatechanged, "ondiscoverystatechanged")
 GK_ATOM(ondownloading, "ondownloading")
 GK_ATOM(onDOMActivate, "onDOMActivate")
 GK_ATOM(onDOMAttrModified, "onDOMAttrModified")
diff --git a/dom/bluetooth/BluetoothAdapter.h b/dom/bluetooth/BluetoothAdapter.h
index cea5a1f22a57..11582aa44aa3 100644
--- a/dom/bluetooth/BluetoothAdapter.h
+++ b/dom/bluetooth/BluetoothAdapter.h
@@ -148,6 +148,7 @@ public:
     SendMediaPlayStatus(const MediaPlayStatus& aMediaPlayStatus, ErrorResult& aRv);
 
   IMPL_EVENT_HANDLER(devicefound);
+  IMPL_EVENT_HANDLER(discoverystatechanged);
   IMPL_EVENT_HANDLER(a2dpstatuschanged);
   IMPL_EVENT_HANDLER(hfpstatuschanged);
   IMPL_EVENT_HANDLER(pairedstatuschanged);
diff --git a/dom/bluetooth/BluetoothCommon.h b/dom/bluetooth/BluetoothCommon.h
index e0aa8f5f7517..4f93cc93572c 100644
--- a/dom/bluetooth/BluetoothCommon.h
+++ b/dom/bluetooth/BluetoothCommon.h
@@ -111,6 +111,11 @@ extern bool gBluetoothDebugFlag;
  */
 #define PAIRED_STATUS_CHANGED_ID             "pairedstatuschanged"
 
+/**
+ * This event would be fired when discovery procedure starts or stops.
+ */
+#define DISCOVERY_STATE_CHANGED_ID           "discoverystatechanged"
+
 /**
  * When receiving a query about current play status from remote device, we'll
  * dispatch an event.
diff --git a/dom/webidl/BluetoothAdapter.webidl b/dom/webidl/BluetoothAdapter.webidl
index 68bcb7ffa241..f7897354f1a2 100644
--- a/dom/webidl/BluetoothAdapter.webidl
+++ b/dom/webidl/BluetoothAdapter.webidl
@@ -51,6 +51,9 @@ interface BluetoothAdapter : EventTarget {
 
            attribute EventHandler   ondevicefound;
 
+  // Fired when discovery process has been done or has started
+           attribute EventHandler   ondiscoverystatechanged;
+
   // Fired when pairing process is completed
            attribute EventHandler   onpairedstatuschanged;