Userscript to remove "at scale" from websites

userscript.js

// ==UserScript==
// @name         drop "at scale"
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       zakx
// @match        http://*/*
// @match        https://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var words = {
        ' at scale':       '',
        'at scale':       '',
        ///////////////////////////////////////////////////////
        '': ''
    };

    var regexs = [],
        replacements = [],
        tagsWhitelist = ['PRE', 'BLOCKQUOTE', 'CODE', 'INPUT', 'BUTTON', 'TEXTAREA'],
        rIsRegexp = /^\/(.+)\/([gim]+)?$/,
        word, text, texts, i, userRegexp;

    // prepareRegex by JoeSimmons
    // used to take a string and ready it for use in new RegExp()
    function prepareRegex (string) {
        return string.replace (/([\[\]\^\&\$\.\(\)\?\/\\\+\{\}\|])/g, '\\$1');
    }

    // function to decide whether a parent tag will have its text replaced or not
    function isTagOk (tag) {
        return tagsWhitelist.indexOf (tag) === -1;
    }

    delete words['']; // so the user can add each entry ending with a comma,
    // I put an extra empty key/value pair in the object.
    // so we need to remove it before continuing

    // convert the 'words' JSON object to an Array
    for (word in words) {
        if (typeof word === 'string' && words.hasOwnProperty (word) ) {
            userRegexp = word.match (rIsRegexp);

            // add the search/needle/query
            if (userRegexp) {
                regexs.push (
                    new RegExp (userRegexp[1], 'g')
                );
            }
            else {
                regexs.push (
                    new RegExp (prepareRegex (word)
                        .replace (/\\?\*/g, function (fullMatch) {
                            return fullMatch === '\\*' ? '*' : '[^ ]*';
                        } ),
                        'g'
                    )
                );
            }

            // add the replacement
            replacements.push(words[word]);
        }
    }

    // do the replacement
    texts = document.evaluate ('//body//text()[ normalize-space(.) != "" ]', document, null, 6, null);
    for (i = 0; text = texts.snapshotItem (i); i += 1) {
        if (isTagOk (text.parentNode.tagName) ) {
            regexs.forEach (function (value, index) {
                text.data = text.data.replace (value, replacements[index]);
            } );
        }
    }
})();