script.user.js

// ==UserScript==
// @name	WorldTimeBuddy hacks
// @description
// @namespace	http://www.worldtimebuddy.com/
// @include     http://www.worldtimebuddy.com/*
// @match       http://www.worldtimebuddy.com/*
// ==/UserScript==

(window.setTimeout(function(){
  document.getElementsByClassName("wrapper")[0].removeChild(document.getElementById("toprek"));
  document.getElementsByClassName("wrapper")[0].removeChild(document.getElementById("social"));
  document.getElementsByClassName("wrapper")[0].removeChild(document.getElementsByClassName("rounded3")[1]);
}(), 1000));