A Tampermonkey® Userscript to correct page content.

PageReplacements.user.js

// ==UserScript==
// @name         PageReplacements
// @namespace    https://lamoree.com/
// @version      0.2
// @description  Correct the content of a web page.
// @author       Joseph Lamoree
// @match        https://*/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var substitutions = [
        [new RegExp("\\bCongress\\b", "g"), "Howling Void"]
    ];
    var treeWalker = document.createTreeWalker(
        document.body,
        NodeFilter.SHOW_TEXT,
        {
            acceptNode: function (node) {
                if (node.nodeValue.trim()) {
                    return NodeFilter.FILTER_ACCEPT;
                }
                return NodeFilter.FILTER_SKIP;
            }
        },
        false
    );
    var index, textNode = null;

    while (textNode = treeWalker.nextNode()) {
        var content = textNode.nodeValue;

        for (index = 0; index < substitutions.length; index++) {
            content = content.replace(substitutions[index][0], substitutions[index][1]);
        }
        textNode.nodeValue = content;
    }
})();