Improve nowoif scriptlet

Related issue:
- uBlockOrigin/uAssets#6019

assets/resources/resources.txt

@@ -1587,6 +1587,17 @@ window.open-defuser.js application/javascript
 		pattern = pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
 	}
 	const rePattern = new RegExp(pattern);
+	const createDecoy = function(tag, urlProp, url) {
+		const decoy = document.createElement('iframe');
+		decoy[urlProp] = url;
+		decoy.style.setProperty('height','1px', 'important');
+		decoy.style.setProperty('position','fixed', 'important');
+		decoy.style.setProperty('top','-1px', 'important');
+		decoy.style.setProperty('width','1px', 'important');
+		document.body.appendChild(decoy);
+		setTimeout(( ) => decoy.remove(), autoRemoveAfter * 1000);
+		return decoy;
+	};
 	window.open = new Proxy(window.open, {
 		apply: function(target, thisArg, args) {
 			log('window.open:', ...args);
@@ -1595,15 +1606,11 @@ window.open-defuser.js application/javascript
 				return target.apply(thisArg, args);
 			}
 			if ( autoRemoveAfter < 0 ) { return null; }
-			const iframe = document.createElement('iframe');
-			iframe.src = url;
-			iframe.style.setProperty('display','none', 'important');
-			iframe.style.setProperty('height','1px', 'important');
-			iframe.style.setProperty('width','1px', 'important');
-			document.body.appendChild(iframe);
-			setTimeout(( ) => iframe.remove(), autoRemoveAfter * 1000);
-			if ( arg3 === '' ) { return iframe.contentWindow; }
-			return new Proxy(iframe.contentWindow, {
+			const decoy1 = createDecoy('iframe', 'src', url);
+			const decoy2 = createDecoy('object', 'data', url);
+			const popup = decoy1.contentWindow || decoy2.contentWindow;
+			if ( arg3 === '' ) { return popup; }
+			return new Proxy(popup, {
 				get: function(target, prop) {
 					log('window.open / get', prop, '===', target[prop]);
 					return target[prop];