ict.ken.be

You can run this code in your browser console and then add a watch for the windowCustomized variable. It will have only custom added window properties or leaks.

windowCustomized = {};
var iframe = document.createElement('iframe');
iframe.onload = function() {
 var standardGlobals = Object.keys(iframe.contentWindow);
 for(var b in window) { 
 const prop = window[b];
 if(window.hasOwnProperty(b) && prop && !prop.toString().includes('native code') && !standardGlobals.includes(b)) {
 windowCustomized[b] = prop;
 }
 }
 //console.info(windowCustomized)
};
iframe.src = 'about:blank';
document.body.appendChild(iframe);
//inspect(windowCustomized);