- Временно отключаем скрипты (проверяем как повляет)

frontend/views/layouts/foot.php

+<?php if (1<0): ?>
 	<!--[if lt IE 9]>
 	<script src="/js/libs/html5shiv/es5-shim.min.js"></script>
 	<script src="/js/libs/html5shiv/html5shiv.min.js"></script>
@@ -31,4 +32,5 @@
 
     <?php // $this->registerJsFile('/plugins/fusioncharts-suite-xt/js/fusioncharts.js', ['position' => yii\web\View::POS_END ]);?>
 
-    <?php $this->registerJsFile('/js/custom.js', ['position' => yii\web\View::POS_END ]);?>
\ No newline at end of file
+    <?php $this->registerJsFile('/js/custom.js', ['position' => yii\web\View::POS_END ]);?>
+<?php endif; ?>
\ No newline at end of file