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Disable page close confirmation

Disable page close confirmation (onBeforeUnload)

  1. // ==UserScript==
  2. // @name        Disable page close confirmation
  3. // @description Disable page close confirmation (onBeforeUnload)
  4. // @namespace   http://nags.must.die
  5. // @version     2.0
  6. // @grant       none
  7. // @run-at      document-start
  8. // @match       *://*/*
  9. // ==/UserScript==
  10.  
  11. (function () {
  12.   var spoofer = {
  13.     enumerable: true,
  14.     configurable: false,
  15.     get: () => null,
  16.     set: fn => fn,
  17.   };
  18.   Object.defineProperties(window, {
  19.     onbeforeunload: spoofer,
  20.     onunload: spoofer,
  21.   });
  22.  
  23.   var originalAdd = EventTarget.prototype.addEventListener;
  24.   EventTarget.prototype.addEventListener = function (type) {
  25.     var tl;
  26.     if (this !== window ||
  27.         typeof type !== 'string' ||
  28.         (tl = type.toLowerCase()) !== 'beforeunload' && tl !== 'unload') {
  29.       originalAdd.apply(this, arguments);
  30.     }
  31.   };
  32. })();