diff --git a/demo-shell-ng2/src/polyfills.ts b/demo-shell-ng2/src/polyfills.ts
index c4cda5e424..fdf0d3805b 100644
--- a/demo-shell-ng2/src/polyfills.ts
+++ b/demo-shell-ng2/src/polyfills.ts
@@ -43,10 +43,12 @@ import 'core-js/es6/set';
 /** Evergreen browsers require these. **/
 import 'core-js/es6/reflect';
 import 'core-js/es7/reflect';
+import 'core-js/es6/array';
+import 'core-js/es7/array';
 
 
 /** ALL Firefox browsers require the following to support `@angular/animation`. **/
-// import 'web-animations-js';  // Run `npm install --save web-animations-js`.
+import 'web-animations-js';  // Run `npm install --save web-animations-js`.
 
 
 
@@ -72,3 +74,4 @@ import 'intl';  // Run `npm install --save intl`.
  *
  * */
 import 'custom-event-polyfill/custom-event-polyfill'  // Run `npm install --save custom-event-polyfill`.
+