diff --git a/src/intro.js b/src/intro.js
index 3b17af8..ce89c69 100644
--- a/src/intro.js
+++ b/src/intro.js
@@ -22,9 +22,9 @@ if (_GM && _GM.registerMenuCommand && _GM.openInTab) {
 new Promise(resolve => {
   const id = '' + Math.random();
   w[id] = resolve;
-  setTimeout(`(function a(){window['${id}'](new Image())})()//# sourceURL=${location.href}`)
+  setTimeout(`(function a(){window['${id}'](new Image());delete window['${id}'];})()//# sourceURL=${location.href}`)
 }).then(d => {
   d.style.display = 'none';
   d.src = 'data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==';
   d.once = false;
-  d.setAttribute('onload', `if(this.once)return;this.once=true;this.remove();const GM=window['${gmId}'];(` + function a () {
+  d.setAttribute('onload', `if(this.once)return;this.once=true;this.remove();const GM=window['${gmId}'];delete window['${gmId}'];(` + function a () {