All my public user scripts

useful_scripts.user.js

// ==UserScript==
// @name         Useful Scripts
// @version      1.3.0
// @description  Useful scripts for developers, to be loaded and used in every page
// @match        http://**/*
// @author       Guilherme Ventura
// @downloadURL  https://rawgit.com/danguilherme/2e6e913ebdd491b06225/raw/useful_scripts.user.js
// @grant        unsafeWindow
// ==/UserScript==
 
unsafeWindow.us = {
  loadScript: function(url,callback) {
    var element = document.createElement("script"); 
    element.src = url; 
    unsafeWindow.document.body.appendChild(element); 
    element.onload=callback;
  },
    
  loadStyle: function(url,callback) {
    var element = document.createElement("link"); 
    element.href = url; 
    element.rel = 'stylesheet';
    element.type = 'text/css';
    unsafeWindow.document.body.appendChild(element); 
    element.onload=callback;
  },
    
  addScript: function(text) {
    var element = document.createElement("script"); 
    element.textContent = text;
    unsafeWindow.document.body.appendChild(element);
  },
  
  jqplz: function(callback) {
    var me = this;
    me.loadScript('//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js', function() {
      callback = callback || function() { unsafeWindow.console.info('jQuery loaded'); };
      me.addScript('window.jQ=jQuery.noConflict(true);(function($) {(' + callback.toString() + ')()})(window.jQ);');
    });
  },
    
  prettify: function(selector, lang) {
    var me = this;
    var doc = unsafeWindow.document;
    var els = doc.querySelectorAll(selector);
    
    for (var i = 0; i < els.length; i++) {
      var el = els[i];
      el.classList.add('prettyprint');
      if(lang) el.classList.add('lang-' + lang);
    }
    
    this.loadScript('//cdnjs.cloudflare.com/ajax/libs/prettify/r298/run_prettify.min.js', function() {
      // if(!me.prettifyStyleLoaded) {
      //    me.loadStyle('//google-code-prettify.googlecode.com/svn/trunk/styles/sons-of-obsidian.css');
      //    me.prettifyStyleLoaded = true;
      //}
    });
  }
}