attochator.user.js

// ==UserScript==
// @name        jQuery Attochator 
// @namespace   Violentmonkey Scripts
// @match       *://*/*
// @grant       none
// @version     1.0
// @author      anderson "z4b0t" bosa
// @description 2/9/2020, 8:35:28 AM
// ==/UserScript==

var existJquery = false;

if (window.top.$) {
  existJquery = window.top.$;
} else if (window.top.jQuery) {
  existJquery = window.top.jQuery;
}
if (!existJquery) {
  var scriptJquery = document.createElement('script');
  scriptJquery.src = 'https://code.jquery.com/jquery-3.4.1.slim.min.js';
  scriptJquery.integrity = 'sha256-pasqAKBDmFT4eHoN2ndd6lN370kFiGUFyTiUHWhU7k8=';
  scriptJquery.crossorigin = 'anonymous';

  var getBodyElem = window.document.querySelector('body');
  getBodyElem.append(scriptJquery);  
}