I found a solution for me: When you've a little bit experience in programming you can make an extension by yourself. I used chatGPT for that. Only problem is, that when you've a website on a webserver outsite of your computer it seems you've to load it in an iframe. And not every site allow this way. Maybe this is also the problem in web panel why it don't load the sites. I've deinstalled the exension, but you coul'd try if it works so set a simple html-file on your main drive (mostly c: ) with an iframe. When you load this file, maybe it loads the website in an iframe (save this file f.e. with text editor (not word) as test.html on your pc, change testurl.com to your URL. and then open file to test if it works in browser. If yes set the path of the file to web panel als page. Does it work?
<!DOCTYPE html>
<html>
<head>
<title>Iframe-Seite</title>
<style>
/* Stellt sicher, dass der iframe die gesamte Seite einnimmt */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
iframe {
height: 100%;
width: 100%;
border: none; /* Entfernt den Rahmen des iframes */
}
</style>
</head>
<body>
<!-- Einbettung der Webseite in einem iframe -->
<iframe src="https://testurl.com"></iframe>
</body>
</html>