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// ==UserScript==
// @name Disable - remove onbeforeunload
// @namespace
// @description Disable - remove the annoying onbeforeunload event
// @include *
// @author Sugiyama Narita Niwa
// ==/UserScript==
var x = document.createElement('script');
x.type = 'text/javascript';
x.innerHTML = 'onbeforeunload = function() {};';
document.body.appendChild(x);