diff --git a/modules/UI/UI.js b/modules/UI/UI.js
index d8d263fa8..9e7389d03 100644
--- a/modules/UI/UI.js
+++ b/modules/UI/UI.js
@@ -416,7 +416,7 @@ function bindEvents() {
         'webkitfullscreenchange mozfullscreenchange fullscreenchange',
         () => {
             let isFullScreen = document.fullscreenElement
-                || document.mozFullScreenElement // current working methods
+                || document.mozFullScreenElement
                 || document.webkitFullscreenElement
                 || document.msFullscreenElement;