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CSS: correction of font family on various sites

Correction of font family to substitute unusual fonts by more common ones

// ==UserScript==
// @name          CSS: correction of font family on various sites
// @description   Correction of font family to substitute unusual fonts by more common ones
// @author        MK
// @namespace     max44
// @homepage      https://greasyfork.org/en/users/309172-max44
// @include       https://f.vision/*
// @include       http://f.vision/*
// @include       https://www.startpage.com/*
// @include       http://www.startpage.com/*
// @icon          https://www.iconninja.com/files/642/487/770/network-website-web-internet-icon.png
// @version       1.1.2
// @license       MIT
// ==/UserScript==

(function() {
  var css = `
  body {
    font-family: "Segoe UI", Arial, Helvetica, sans-serif !important;
  }
  `;

  if (typeof GM_addStyle != 'undefined') {
    GM_addStyle(css);
  } else if (typeof PRO_addStyle != 'undefined') {
    PRO_addStyle(css);
  } else if (typeof addStyle != 'undefined') {
    addStyle(css);
  } else {
    var node = document.createElement('style');
    node.type = 'text/css';
    node.appendChild(document.createTextNode(css));
    document.documentElement.appendChild(node);
  }
})();