diff --git a/effects/frozenapp/package/contents/code/main.js b/effects/frozenapp/package/contents/code/main.js
index 7557bc414..a8c95e9de 100644
--- a/effects/frozenapp/package/contents/code/main.js
+++ b/effects/frozenapp/package/contents/code/main.js
@@ -1,140 +1,129 @@
 /********************************************************************
  KWin - the KDE window manager
  This file is part of the KDE project.
 
  Copyright (C) 2017 Kai Uwe Broulik <kde@privat.broulik.de>
 
 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.
 
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
-/*global effect, effects, animate, animationTime, Effect*/
+
+"use strict";
+
 var frozenAppEffect = {
     inDuration: animationTime(1500),
     outDuration: animationTime(250),
     loadConfig: function () {
-        "use strict";
         frozenAppEffect.inDuration = animationTime(1500);
         frozenAppEffect.outDuration = animationTime(250);
     },
     windowAdded: function (window) {
-        "use strict";
         if (!window || !window.unresponsive) {
             return;
         }
         frozenAppEffect.windowBecameUnresponsive(window);
     },
     windowBecameUnresponsive: function (window) {
-        "use strict";
         if (window.unresponsiveAnimation) {
             return;
         }
         frozenAppEffect.startAnimation(window, frozenAppEffect.inDuration);
     },
     startAnimation: function (window, duration) {
-        "use strict";
         if (!window.visible) {
             return;
         }
         window.unresponsiveAnimation = set({
             window: window,
             duration: duration,
             animations: [{
                 type: Effect.Saturation,
                 to: 0.1
             }, {
                 type: Effect.Brightness,
                 to: 1.5
             }]
         });
     },
     windowClosed: function (window) {
-        "use strict";
         frozenAppEffect.cancelAnimation(window);
         if (!window.unresponsive) {
             return;
         }
         frozenAppEffect.windowBecameResponsive(window);
     },
     windowBecameResponsive: function (window) {
-        "use strict";
         if (!window.unresponsiveAnimation) {
             return;
         }
         cancel(window.unresponsiveAnimation);
         window.unresponsiveAnimation = undefined;
 
         animate({
             window: window,
             duration: frozenAppEffect.outDuration,
             animations: [{
                 type: Effect.Saturation,
                 from: 0.1,
                 to: 1.0
             }, {
                 type: Effect.Brightness,
                 from: 1.5,
                 to: 1.0
             }]
         });
     },
     cancelAnimation: function (window) {
-        "use strict";
         if (window.unresponsiveAnimation) {
             cancel(window.unresponsiveAnimation);
             window.unresponsiveAnimation = undefined;
         }
     },
     desktopChanged: function () {
-        "use strict";
-
         var windows = effects.stackingOrder;
         for (var i = 0, length = windows.length; i < length; ++i) {
             var window = windows[i];
             frozenAppEffect.cancelAnimation(window);
             frozenAppEffect.restartAnimation(window);
         }
     },
     unresponsiveChanged: function (window) {
-        "use strict";
         if (window.unresponsive) {
             frozenAppEffect.windowBecameUnresponsive(window);
         } else {
             frozenAppEffect.windowBecameResponsive(window);
         }
     },
     restartAnimation: function (window) {
-        "use strict";
         if (!window || !window.unresponsive) {
             return;
         }
         frozenAppEffect.startAnimation(window, 1);
     },
     init: function () {
-        "use strict";
-
         effects.windowAdded.connect(frozenAppEffect.windowAdded);
         effects.windowClosed.connect(frozenAppEffect.windowClosed);
         effects.windowMinimized.connect(frozenAppEffect.cancelAnimation);
         effects.windowUnminimized.connect(frozenAppEffect.restartAnimation);
         effects.windowUnresponsiveChanged.connect(frozenAppEffect.unresponsiveChanged);
         effects['desktopChanged(int,int)'].connect(frozenAppEffect.desktopChanged);
         effects.desktopPresenceChanged.connect(frozenAppEffect.cancelAnimation);
         effects.desktopPresenceChanged.connect(frozenAppEffect.restartAnimation);
 
         var windows = effects.stackingOrder;
         for (var i = 0, length = windows.length; i < length; ++i) {
             frozenAppEffect.restartAnimation(windows[i]);
         }
     }
 };
 frozenAppEffect.init();