diff --git a/packages/selenium-ide/src/content/prompt-injector.js b/packages/selenium-ide/src/content/prompt-injector.js
index <HASH>..<HASH> 100644
--- a/packages/selenium-ide/src/content/prompt-injector.js
+++ b/packages/selenium-ide/src/content/prompt-injector.js
@@ -15,6 +15,7 @@
  *
  */
 import browser from "webextension-polyfill";
+import "./closure-polyfill";
 import { record } from "./record-api";
 import { selenium } from "./commands-api";
load closure polyfill before the Selenium objects loads the closure library