--- a/dom/base/nsGlobalWindow.cpp
+++ b/dom/base/nsGlobalWindow.cpp
@@ -569,17 +569,17 @@ extern uint64_t
 NextWindowID();
 }
 }
 
 nsPIDOMWindow::nsPIDOMWindow(nsPIDOMWindow *aOuterWindow)
 : mFrameElement(nullptr), mDocShell(nullptr), mModalStateDepth(0),
   mRunningTimeout(nullptr), mMutationBits(0), mIsDocumentLoaded(false),
   mIsHandlingResizeEvent(false), mIsInnerWindow(aOuterWindow != nullptr),
-  mMayHavePaintEventListener(false),
+  mMayHavePaintEventListener(false), mMayHaveTouchEventListener(false),
   mMayHaveMouseEnterLeaveEventListener(false),
   mMayHavePointerEnterLeaveEventListener(false),
   mIsModalContentWindow(false),
   mIsActive(false), mIsBackground(false),
   mAudioMuted(false), mAudioVolume(1.0),
   mDesktopModeViewport(false), mInnerWindow(nullptr),
   mOuterWindow(aOuterWindow),
   // Make sure no actual window ends up with mWindowID == 0
@@ -9838,16 +9838,32 @@ void nsGlobalWindow::SetIsBackground(boo
     nsGlobalWindow* inner = GetCurrentInnerWindowInternal();
     if (inner) {
       inner->SyncGamepadState();
     }
   }
 #endif
 }
 
+void nsGlobalWindow::MaybeUpdateTouchState()
+{
+  FORWARD_TO_INNER_VOID(MaybeUpdateTouchState, ());
+
+  if (mMayHaveTouchEventListener) {
+    nsCOMPtr<nsIObserverService> observerService =
+      services::GetObserverService();
+
+    if (observerService) {
+      observerService->NotifyObservers(static_cast<nsIDOMWindow*>(this),
+                                       DOM_TOUCH_LISTENER_ADDED,
+                                       nullptr);
+    }
+  }
+}
+
 void
 nsGlobalWindow::EnableGamepadUpdates()
 {
   MOZ_ASSERT(IsInnerWindow());
 
   if (mHasGamepad) {
 #ifdef MOZ_GAMEPAD
     nsRefPtr<GamepadService> gamepadsvc(GamepadService::GetService());

--- a/dom/base/nsGlobalWindow.h
+++ b/dom/base/nsGlobalWindow.h
@@ -463,16 +463,18 @@ public:
 
   virtual void EnterModalState() override;
   virtual void LeaveModalState() override;
 
   // Outer windows only.
   virtual bool CanClose() override;
   virtual void ForceClose() override;
 
+  virtual void MaybeUpdateTouchState() override;
+
   // Outer windows only.
   virtual bool DispatchCustomEvent(const nsAString& aEventName) override;
   bool DispatchResizeEvent(const mozilla::CSSIntSize& aSize);
 
   // Inner windows only.
   virtual void RefreshCompartmentPrincipal() override;
 
   // Outer windows only.

--- a/dom/base/nsNodeUtils.cpp
+++ b/dom/base/nsNodeUtils.cpp
@@ -514,16 +514,19 @@ nsNodeUtils::CloneAndAdopt(nsINode *aNod
       nsPIDOMWindow* window = newDoc->GetInnerWindow();
       if (window) {
         EventListenerManager* elm = aNode->GetExistingListenerManager();
         if (elm) {
           window->SetMutationListeners(elm->MutationListenerBits());
           if (elm->MayHavePaintEventListener()) {
             window->SetHasPaintEventListeners();
           }
+          if (elm->MayHaveTouchEventListener()) {
+            window->SetHasTouchEventListeners();
+          }
           if (elm->MayHaveMouseEnterLeaveEventListener()) {
             window->SetHasMouseEnterLeaveEventListeners();
           }
           if (elm->MayHavePointerEnterLeaveEventListener()) {
             window->SetHasPointerEnterLeaveEventListeners();
           }
         }
       }

--- a/dom/base/nsPIDOMWindow.h
+++ b/dom/base/nsPIDOMWindow.h
@@ -58,18 +58,18 @@ enum PopupControlState {
 enum UIStateChangeType
 {
   UIStateChangeType_NoChange,
   UIStateChangeType_Set,
   UIStateChangeType_Clear
 };
 
 #define NS_PIDOMWINDOW_IID \
-{ 0x4178bd68, 0xa3f7, 0x4ff7, \
-  { 0xa6, 0x27, 0x4a, 0x99, 0xa1, 0xe0, 0x42, 0x37 } }
+{ 0x2485d4d7, 0xf7cb, 0x481e, \
+  { 0x9c, 0x89, 0xb2, 0xa8, 0x12, 0x67, 0x7f, 0x97 } }
 
 class nsPIDOMWindow : public nsIDOMWindowInternal
 {
 public:
   NS_DECLARE_STATIC_IID_ACCESSOR(NS_PIDOMWINDOW_IID)
 
   virtual nsPIDOMWindow* GetPrivateRoot() = 0;
 
@@ -155,16 +155,18 @@ public:
       NS_ERROR("HasMutationListeners() called on orphan inner window!");
 
       return;
     }
 
     mMutationBits |= aType;
   }
 
+  virtual void MaybeUpdateTouchState() {}
+
   nsIDocument* GetExtantDoc() const
   {
     return mDoc;
   }
   nsIURI* GetDocumentURI() const;
   nsIURI* GetDocBaseURI() const;
 
   nsIDocument* GetDoc()
@@ -444,16 +446,28 @@ public:
    * or content in that document) has a paint event listener.
    */
   bool HasPaintEventListeners()
   {
     return mMayHavePaintEventListener;
   }
   
   /**
+   * Call this to indicate that some node (this window, its document,
+   * or content in that document) has a touch event listener.
+   */
+  void SetHasTouchEventListeners()
+  {
+    if (!mMayHaveTouchEventListener) {
+      mMayHaveTouchEventListener = true;
+      MaybeUpdateTouchState();
+    }
+  }
+
+  /**
    * Moves the top-level window into fullscreen mode if aIsFullScreen is true,
    * otherwise exits fullscreen. If aRequireTrust is true, this method only
    * changes window state in a context trusted for write.
    *
    * If aHMD is not null, the window is made full screen on the given VR HMD
    * device instead of its currrent display.
    *
    * Outer windows only.
@@ -763,16 +777,17 @@ protected:
   nsTimeout             *mRunningTimeout;
 
   uint32_t               mMutationBits;
 
   bool                   mIsDocumentLoaded;
   bool                   mIsHandlingResizeEvent;
   bool                   mIsInnerWindow;
   bool                   mMayHavePaintEventListener;
+  bool                   mMayHaveTouchEventListener;
   bool                   mMayHaveMouseEnterLeaveEventListener;
   bool                   mMayHavePointerEnterLeaveEventListener;
 
   // This variable is used on both inner and outer windows (and they
   // should match).
   bool                   mIsModalContentWindow;
 
   // Tracks activation state that's used for :-moz-window-inactive.

--- a/dom/events/EventListenerManager.cpp
+++ b/dom/events/EventListenerManager.cpp
@@ -92,16 +92,17 @@ MutationBitForEventType(uint32_t aEventT
 
 uint32_t EventListenerManager::sMainThreadCreatedCount = 0;
 
 EventListenerManager::EventListenerManager(EventTarget* aTarget)
   : mMayHavePaintEventListener(false)
   , mMayHaveMutationListeners(false)
   , mMayHaveCapturingListeners(false)
   , mMayHaveSystemGroupListeners(false)
+  , mMayHaveTouchEventListener(false)
   , mMayHaveMouseEnterLeaveEventListener(false)
   , mMayHavePointerEnterLeaveEventListener(false)
   , mClearingListeners(false)
   , mIsMainThreadELM(NS_IsMainThread())
   , mNoListenerForEvent(0)
   , mTarget(aTarget)
 {
   NS_ASSERTION(aTarget, "unexpected null pointer");
@@ -322,16 +323,27 @@ EventListenerManager::AddEventListenerIn
       window->EnableNetworkEvent(NS_NETWORK_UPLOAD_EVENT);
     }
   } else if (aTypeAtom == nsGkAtoms::onmoznetworkdownload) {
     nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
     if (window) {
       window->EnableNetworkEvent(NS_NETWORK_DOWNLOAD_EVENT);
     }
 #endif // MOZ_B2G
+  } else if (aTypeAtom == nsGkAtoms::ontouchstart ||
+             aTypeAtom == nsGkAtoms::ontouchend ||
+             aTypeAtom == nsGkAtoms::ontouchmove ||
+             aTypeAtom == nsGkAtoms::ontouchcancel) {
+    mMayHaveTouchEventListener = true;
+    nsPIDOMWindow* window = GetInnerWindowForTarget();
+    // we don't want touchevent listeners added by scrollbars to flip this flag
+    // so we ignore listeners created with system event flag
+    if (window && !aFlags.mInSystemGroup) {
+      window->SetHasTouchEventListeners();
+    }
   } else if (aType >= NS_POINTER_EVENT_START && aType <= NS_POINTER_LOST_CAPTURE) {
     nsPIDOMWindow* window = GetInnerWindowForTarget();
     if (aTypeAtom == nsGkAtoms::onpointerenter ||
         aTypeAtom == nsGkAtoms::onpointerleave) {
       mMayHavePointerEnterLeaveEventListener = true;
       if (window) {
 #ifdef DEBUG
         nsCOMPtr<nsIDocument> d = window->GetExtantDoc();

--- a/dom/events/EventListenerManager.h
+++ b/dom/events/EventListenerManager.h
@@ -383,16 +383,22 @@ public:
   static void Shutdown();
 
   /**
    * Returns true if there may be a paint event listener registered,
    * false if there definitely isn't.
    */
   bool MayHavePaintEventListener() { return mMayHavePaintEventListener; }
 
+  /**
+   * Returns true if there may be a touch event listener registered,
+   * false if there definitely isn't.
+   */
+  bool MayHaveTouchEventListener() { return mMayHaveTouchEventListener; }
+
   bool MayHaveMouseEnterLeaveEventListener() { return mMayHaveMouseEnterLeaveEventListener; }
   bool MayHavePointerEnterLeaveEventListener() { return mMayHavePointerEnterLeaveEventListener; }
 
   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
 
   uint32_t ListenerCount() const
   {
     return mListeners.Length();
@@ -532,16 +538,17 @@ protected:
 
   already_AddRefed<nsIScriptGlobalObject>
   GetScriptGlobalAndDocument(nsIDocument** aDoc);
 
   uint32_t mMayHavePaintEventListener : 1;
   uint32_t mMayHaveMutationListeners : 1;
   uint32_t mMayHaveCapturingListeners : 1;
   uint32_t mMayHaveSystemGroupListeners : 1;
+  uint32_t mMayHaveTouchEventListener : 1;
   uint32_t mMayHaveMouseEnterLeaveEventListener : 1;
   uint32_t mMayHavePointerEnterLeaveEventListener : 1;
   uint32_t mClearingListeners : 1;
   uint32_t mIsMainThreadELM : 1;
   uint32_t mNoListenerForEvent : 23;
 
   nsAutoTObserverArray<Listener, 2> mListeners;
   dom::EventTarget* MOZ_NON_OWNING_REF mTarget;