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Tool For All Website

Block websites from knowing if you switched tabs/windows

이 스크립트는 직접 설치해서 쓰는 게 아닙니다. 다른 스크립트가 메타 명령 // @require https://update.greasyfork.org/scripts/457405/1133633/Tool%20For%20All%20Website.js(으)로 포함하여 쓰는 라이브러리입니다.

질문, 리뷰하거나, 이 스크립트를 신고하세요. 
// ==UserScript==
// @name        Tool For All Website
// @namespace   SuperNova
// @match       *://*/*
// @run-at      document-start
// @grant       GM_xmlhttpRequest
// @version     1.1
// @author      Saputra
// @description Block websites from knowing if you switched tabs/windows

// ==/UserScript==

// This userscript blocks the page visibility API and to some extent the old blur/focus APIs.

let events_to_block = [
  "visibilitychange",
  "webkitvisibilitychange",
  "mozvisibilitychange",
  "hasFocus",
  "blur",
  "focus",
  "mouseleave"
]

for (event_name of events_to_block) {
  document.addEventListener(event_name, function (event) {
      event.preventDefault();
      event.stopPropagation();
      event.stopImmediatePropagation();
  }, true);
}

for (event_name of events_to_block) {
  window.addEventListener(event_name, function (event) {
      event.preventDefault();
      event.stopPropagation();
      event.stopImmediatePropagation();
  }, true);
}


document.hasFocus = function () { return true; };
document.onvisibilitychange = null;
Object.defineProperty(document, "visibilityState", { value: "visible" });
Object.defineProperty(document, "hidden", { value: false });
Object.defineProperty(document, "mozHidden", { value: false });
Object.defineProperty(document, "webkitHidden", { value: false });
Object.defineProperty(document, "webkitVisibilityState", { value: "visible" });