diff --git a/widget/windows/WinIMEHandler.cpp b/widget/windows/WinIMEHandler.cpp
index 1f81ad23ba2e..702caa98537a 100644
--- a/widget/windows/WinIMEHandler.cpp
+++ b/widget/windows/WinIMEHandler.cpp
@@ -168,6 +168,34 @@ IMEHandler::GetUpdatePreference()
   return nsIMEUpdatePreference(false, false);
 }
 
+void
+IMEHandler::SetOpenState(nsWindow* aWindow, bool aOpen)
+{
+#ifdef NS_ENABLE_TSF
+  if (sIsInTSFMode) {
+    nsTextStore::SetIMEOpenState(aOpen);
+    return;
+  }
+#endif //NS_ENABLE_TSF
+
+  nsIMEContext IMEContext(aWindow->GetWindowHandle());
+  IMEContext.SetOpenState(aOpen);
+}
+
+// static
+bool
+IMEHandler::GetOpenState(nsWindow* aWindow)
+{
+#ifdef NS_ENABLE_TSF
+  if (sIsInTSFMode) {
+    return nsTextStore::GetIMEOpenState();
+  }
+#endif //NS_ENABLE_TSF
+
+  nsIMEContext IMEContext(aWindow->GetWindowHandle());
+  return IMEContext.GetOpenState();
+}
+
 #ifdef DEBUG
 // static
 bool
diff --git a/widget/windows/WinIMEHandler.h b/widget/windows/WinIMEHandler.h
index 58fc57c047cc..cfacfd12cc97 100644
--- a/widget/windows/WinIMEHandler.h
+++ b/widget/windows/WinIMEHandler.h
@@ -67,6 +67,12 @@ public:
    */
   static nsIMEUpdatePreference GetUpdatePreference();
 
+  /**
+   * Sets and Gets IME open state.
+   */
+  static void SetOpenState(nsWindow* aWindow, bool aOpen);
+  static bool GetOpenState(nsWindow* aWindow);
+
   /**
    * "Kakutei-Undo" of ATOK or WXG (both of them are Japanese IME) causes
    * strange WM_KEYDOWN/WM_KEYUP/WM_CHAR message pattern.  So, when this
diff --git a/widget/windows/nsIMM32Handler.h b/widget/windows/nsIMM32Handler.h
index ccdd9e002fe9..3dd46bea62a3 100644
--- a/widget/windows/nsIMM32Handler.h
+++ b/widget/windows/nsIMM32Handler.h
@@ -45,6 +45,22 @@ public:
     return !!mIMC;
   }
 
+  void SetOpenState(bool aOpen) const
+  {
+    if (!mIMC) {
+      return;
+    }
+    ::ImmSetOpenStatus(mIMC, aOpen);
+  }
+
+  bool GetOpenState() const
+  {
+    if (!mIMC) {
+      return false;
+    }
+    return (::ImmGetOpenStatus(mIMC) != FALSE);
+  }
+
 protected:
   nsIMEContext()
   {
diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index d53d10dbd0e6..0238e42a1004 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -7417,13 +7417,7 @@ nsWindow::SetInputContext(const InputContext& aContext,
   if (enable &&
       mInputContext.mIMEState.mOpen != IMEState::DONT_CHANGE_OPEN_STATE) {
     bool open = (mInputContext.mIMEState.mOpen == IMEState::OPEN);
-#ifdef NS_ENABLE_TSF
-    nsTextStore::SetIMEOpenState(open);
-#endif //NS_ENABLE_TSF
-    nsIMEContext IMEContext(mWnd);
-    if (IMEContext.IsValid()) {
-      ::ImmSetOpenStatus(IMEContext.get(), open);
-    }
+    IMEHandler::SetOpenState(this, open);
   }
 }
 
@@ -7433,20 +7427,11 @@ nsWindow::GetInputContext()
   mInputContext.mIMEState.mOpen = IMEState::CLOSED;
   switch (mInputContext.mIMEState.mEnabled) {
     case IMEState::ENABLED:
-    case IMEState::PLUGIN: {
-      nsIMEContext IMEContext(mWnd);
-      if (IMEContext.IsValid()) {
-        mInputContext.mIMEState.mOpen =
-          ::ImmGetOpenStatus(IMEContext.get()) ? IMEState::OPEN :
-                                                 IMEState::CLOSED;
-      }
-#ifdef NS_ENABLE_TSF
-      if (mInputContext.mIMEState.mOpen == IMEState::CLOSED &&
-          nsTextStore::GetIMEOpenState()) {
+    case IMEState::PLUGIN:
+      if (IMEHandler::GetOpenState(this)) {
         mInputContext.mIMEState.mOpen = IMEState::OPEN;
       }
-#endif //NS_ENABLE_TSF
-    }
+      break;
   }
   return mInputContext;
 }