Replaces EveryTimeZone predefined timezones with custom ones

EveryTimeZoneEnhancer.user.js

// ==UserScript==
// @name         EveryTimeZone Enhancer
// @version      0.1-alpha-poc
// @description  Replaces EveryTimeZone predefined timezones with custom ones
// @author       Victor Shmoylov
// @match        http://everytimezone.com/*
// @grant        none
// @run-at       document-start
// @require https://code.jquery.com/jquery-3.1.0.min.js
// @require https://code.jquery.com/ui/1.12.0/jquery-ui.min.js
// ==/UserScript==


var changed = 0; // script need to be edited with

window.addEventListener('beforescriptexecute', function(e) {

    ///for external script:
	src = e.target.src;
    console.log(src.search(/data\.js/));
	if (src.search(/data\.js/) != -1) {
                changed++;
		e.preventDefault();
		e.stopPropagation();
        var parent = e.target.parentNode;
        parent.appendChild(document.createElement('script'))
             .innerHTML = NewScript1;
		console.log("replacing");
	}

    
    ///when done, remove the listener:
	if(changed == 2) window.removeEventListener(e.type, arguments.callee, true);
    

}, true);

////////////////////////////////////////////////
var NewScript1='var data = [[-4.0,"Boston","EDT UTC-4",true],[0.0,"UTC","",true],[2.0,"Gdańsk","CEST UTC+2",true],[6.0,"Bishkek","UTC+6.0",true],[7.0,"Tomsk","+07 UTC+7",true]];';