diff --git a/web/firefoxcom.js b/web/firefoxcom.js
index 12687a231..ba3790e10 100644
--- a/web/firefoxcom.js
+++ b/web/firefoxcom.js
@@ -403,7 +403,7 @@ class FirefoxExternalServices extends DefaultExternalServices {
           break;
       }
     });
-    FirefoxCom.requestSync("initPassiveLoading", null);
+    FirefoxCom.request("initPassiveLoading", null);
   }
 
   static reportTelemetry(data) {