h3h3 to Pedo_Troll

Structure:
h3h3-swap/
├─ manifest.json
├─ content.js

1. Open chrome://extensions.
2. Toggle Developer mode (top-right).
3. Click Load unpacked and select your h3h3-swap/ folder.

manifest.json

{
  "manifest_version": 3,
  "name": "H3H3 Name Swap",
  "description": "On r/h3h3productions, replace 'Ethan' / 'Ethan Klein' with 'Pedo_Troll'.",
  "version": "1.0.0",
  "content_scripts": [
    {
      "matches": [
        "https://www.reddit.com/r/h3h3productions/*",
        "https://old.reddit.com/r/h3h3productions/*",
        "https://www.reddit.com/r/H3H3Productions/*",
        "https://old.reddit.com/r/H3H3Productions/*"
      ],
      "js": ["content.js"],
      "run_at": "document_idle"
    }
  ]
}


content.js

const RE_FULL = /\bEthan Klein\b/g;
const RE_FIRST = /\bEthan\b/g;
const REPLACEMENT = "Pedo_Troll";
const SKIP_TAGS = new Set(["SCRIPT", "STYLE", "NOSCRIPT", "CODE", "PRE", "TEXTAREA"]);
function isEditable(el) {
  if (!el || el === document.body) return false;
  if (el.nodeType !== 1) return isEditable(el.parentNode);
  const tag = el.tagName;
  if (SKIP_TAGS.has(tag)) return true;
  const ce = el.getAttribute("contenteditable");
  if (ce === "" || ce === "true") return true;
  if (tag === "INPUT") return true;
  return isEditable(el.parentNode);
}

function replaceInTextNode(node) {
  const original = node.nodeValue;
  if (!original || original.indexOf("Ethan") === -1) return;

  let updated = original.replace(RE_FULL, REPLACEMENT).replace(RE_FIRST, REPLACEMENT);
  if (updated !== original) {
    node.nodeValue = updated;
  }
}

function walkAndReplace(root) {
  const walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, {
    acceptNode(node) {
      if (isEditable(node.parentNode)) return NodeFilter.FILTER_REJECT;
      if (!node.nodeValue || !node.nodeValue.trim()) return NodeFilter.FILTER_REJECT;
      return NodeFilter.FILTER_ACCEPT;
    }
  });
  const toProcess = [];
  let n;
  while ((n = walker.nextNode())) toProcess.push(n);
  toProcess.forEach(replaceInTextNode);
}

function init() {
  walkAndReplace(document.body);
  const mo = new MutationObserver((mutations) => {
    for (const m of mutations) {
      if (m.type === "childList") {
        m.addedNodes.forEach((node) => {
          if (node.nodeType === 1) {
            if (!isEditable(node)) walkAndReplace(node);
          } else if (node.nodeType === 3) {
            replaceInTextNode(node);
          }
        });
      } else if (m.type === "characterData" && m.target.nodeType === 3) {
        replaceInTextNode(m.target);
      }
    }
  });

  mo.observe(document.body, {
    subtree: true,
    childList: true,
    characterData: true
  });
}

if (document.readyState === "loading") {
  document.addEventListener("DOMContentLoaded", init);
} else {
  init();
}