Imports lodash (and any other npm package) via tampermonkey & requirify.

Require Lodash

// ==UserScript==
// @name         Require Lodash
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Asynchronously inject lodash into all webpages
// @author       Steven Hao
// @match        *://*/*
// @grant        none
// ==/UserScript==


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},{}],2:[function(require,module,exports){
var request=require("browser-request");window.require=function(name,moduleName){_require=require,moduleName||(moduleName=name),console.log("Fetching "+moduleName+"... just one second"),request("https://wzrd.in/bundle/"+moduleName+"@latest/",function(er,res,body){require=null,eval(body),window[name]=require(moduleName),require=_require,console.log("Finished getting "+moduleName)})};
},{"browser-request":1}]},{},[2]);

(function() {
    'use strict';

    if (typeof window._ === 'undefined') {
        require('_', 'lodash');
    }
})();