diff --git a/src/content_script.js b/src/content_script.js
index b25fd44b..e48b3938 100644
--- a/src/content_script.js
+++ b/src/content_script.js
@@ -569,12 +569,7 @@ async function CheckIfURLShouldBeBlocked() {
 
 // Cross-browser implementation of element.addEventListener()
 function addPassiveWindowOnloadListener() {
-  const activeOnloadFunction = window.onload;
   window.addEventListener("load", function() {
-  // window.onload = function () {
-    if (typeof activeOnloadFunction === "function") {
-      activeOnloadFunction();
-    }
     CheckIfURLShouldBeBlocked();
   }, false);
 }