diff --git a/atom/browser/api/atom_api_top_level_window.cc b/atom/browser/api/atom_api_top_level_window.cc
index c05c1475d0ba..0a283412bbda 100644
--- a/atom/browser/api/atom_api_top_level_window.cc
+++ b/atom/browser/api/atom_api_top_level_window.cc
@@ -163,11 +163,11 @@ void TopLevelWindow::OnWindowEndSession() {
 }
 
 void TopLevelWindow::OnWindowBlur() {
-  Emit("blur");
+  EmitEventSoon("blur");
 }
 
 void TopLevelWindow::OnWindowFocus() {
-  Emit("focus");
+  EmitEventSoon("focus");
 }
 
 void TopLevelWindow::OnWindowShow() {
diff --git a/atom/browser/api/atom_api_top_level_window.h b/atom/browser/api/atom_api_top_level_window.h
index 641f4b320ef2..f261c0f6cd00 100644
--- a/atom/browser/api/atom_api_top_level_window.h
+++ b/atom/browser/api/atom_api_top_level_window.h
@@ -14,6 +14,7 @@
 #include "atom/browser/native_window.h"
 #include "atom/browser/native_window_observer.h"
 #include "atom/common/api/atom_api_native_image.h"
+#include "content/public/browser/browser_thread.h"
 #include "native_mate/handle.h"
 
 namespace atom {
@@ -215,6 +216,14 @@ class TopLevelWindow : public mate::TrackableObject<TopLevelWindow>,
   // Remove this window from parent window's |child_windows_|.
   void RemoveFromParentChildWindows();
 
+  template<typename... Args>
+  void EmitEventSoon(base::StringPiece eventName) {
+    content::BrowserThread::PostTask(
+        content::BrowserThread::UI, FROM_HERE,
+        base::BindOnce(base::IgnoreResult(&TopLevelWindow::Emit<Args...>),
+                       weak_factory_.GetWeakPtr(), eventName));
+  }
+
 #if defined(OS_WIN)
   typedef std::map<UINT, MessageCallback> MessageCallbackMap;
   MessageCallbackMap messages_callback_map_;
diff --git a/atom/browser/native_window_views.cc b/atom/browser/native_window_views.cc
index 0dba39942f92..f724addd3539 100644
--- a/atom/browser/native_window_views.cc
+++ b/atom/browser/native_window_views.cc
@@ -1104,12 +1104,10 @@ void NativeWindowViews::OnWidgetActivationChanged(views::Widget* changed_widget,
   if (changed_widget != widget())
     return;
 
-  // Post the notification to next tick.
-  content::BrowserThread::PostTask(
-      content::BrowserThread::UI, FROM_HERE,
-      base::Bind(active ? &NativeWindow::NotifyWindowFocus
-                        : &NativeWindow::NotifyWindowBlur,
-                 GetWeakPtr()));
+  if (active)
+    NativeWindow::NotifyWindowFocus();
+  else
+    NativeWindow::NotifyWindowBlur();
 
   // Hide menu bar when window is blured.
   if (!active && IsMenuBarAutoHide() && IsMenuBarVisible())
diff --git a/spec/api-browser-window-spec.js b/spec/api-browser-window-spec.js
index f69071e66aff..8b4f5d187187 100644
--- a/spec/api-browser-window-spec.js
+++ b/spec/api-browser-window-spec.js
@@ -399,8 +399,7 @@ describe('BrowserWindow module', () => {
     })
   })
 
-  // TODO(alexeykuzmin): [Ch66] Enable the test. Passes locally.
-  xdescribe('BrowserWindow.getFocusedWindow()', (done) => {
+  describe('BrowserWindow.getFocusedWindow()', (done) => {
     it('returns the opener window when dev tools window is focused', (done) => {
       w.show()
       w.webContents.once('devtools-focused', () => {
@@ -611,8 +610,7 @@ describe('BrowserWindow module', () => {
     })
   })
 
-  // TODO(alexeykuzmin): [Ch66] Enable the test. Passes locally.
-  xdescribe('BrowserWindow.alwaysOnTop() resets level on minimize', () => {
+  describe('BrowserWindow.alwaysOnTop() resets level on minimize', () => {
     before(function () {
       if (process.platform !== 'darwin') {
         this.skip()
@@ -1817,8 +1815,7 @@ describe('BrowserWindow module', () => {
     })
   })
 
-  // TODO(alexeykuzmin): [Ch66] Enable the tests. They pass locally.
-  xdescribe('document.visibilityState/hidden', () => {
+  describe('document.visibilityState/hidden', () => {
     beforeEach(() => { w.destroy() })
 
     function onVisibilityChange (callback) {
@@ -2421,7 +2418,6 @@ describe('BrowserWindow module', () => {
       })
     })
 
-    // TODO(alexeykuzmin): [Ch66] Enable the test. It passes locally.
     describe('kiosk state', () => {
       before(function () {
         // Only implemented on macOS.
@@ -2469,8 +2465,7 @@ describe('BrowserWindow module', () => {
       })
     })
 
-    // TODO(alexeykuzmin): [Ch66] Enable the tests. They pass locally.
-    xdescribe('fullscreen state', () => {
+    describe('fullscreen state', () => {
       before(function () {
         // Only implemented on macOS.
         if (process.platform !== 'darwin') {
@@ -2618,8 +2613,7 @@ describe('BrowserWindow module', () => {
       }
     })
 
-    // TODO(alexeykuzmin): [Ch66] Enable the test. Fails on CI bots, passes locally.
-    xit('exits HTML fullscreen when window leaves fullscreen', (done) => {
+    it('exits HTML fullscreen when window leaves fullscreen', (done) => {
       w.destroy()
       w = new BrowserWindow()
       w.webContents.once('did-finish-load', () => {
diff --git a/spec/api-web-contents-spec.js b/spec/api-web-contents-spec.js
index b1b1d206a293..1cb169e769fa 100644
--- a/spec/api-web-contents-spec.js
+++ b/spec/api-web-contents-spec.js
@@ -335,8 +335,7 @@ describe('webContents module', () => {
     })
   })
 
-  // TODO(alexeykuzmin): [Ch66] Enable the test. Passes locally.
-  xdescribe('focus()', () => {
+  describe('focus()', () => {
     describe('when the web contents is hidden', () => {
       it('does not blur the focused window', (done) => {
         ipcMain.once('answer', (event, parentFocused, childFocused) => {