OwO.js

document.title = "OwO";

if (window.location.href.match(/https?:\/\/www\.google\.[^\/]*\/search\?/)) {
  try {
    var oldLogo = document.getElementById("logo");
    var newLogo = document.createElement("img");
    newLogo.id = "User-Logo";
    newLogo.src = "https://i.ibb.co/cCWTKTX/Ow-O-92x30dp.png";
    newLogo.height = "30";
    newLogo.width = "92";
    newLogo.onclick = function () {
      window.location.href = "https://www.google.com/";
    };
    oldLogo.parentNode.replaceChild(newLogo, oldLogo);
  } catch (e) {
    console.log(`Error overwriting search Google logo: ${e}`);
  }
} else if (window.location.href.match(/https?:\/\/www\.google\.[^\/]*\//)) {
  try {
    var oldLogo = document.getElementsByClassName("lnXdpd")[0];
    var newLogo = document.createElement("img");
    newLogo.id = "User-Logo";
    newLogo.src = "https://i.ibb.co/GHzBb1G/Ow-O-272x92dp.png";
    oldLogo.parentNode.replaceChild(newLogo, oldLogo);
  } catch (e) {
    console.log(`Error overwriting main Google logo: ${e}`);
  }
}

var replaceArry = [
  [/google/gi, "OwO"],
  [/Google/gi, "OwO"],
  [/Gmail/gi, "OwOmail"],
  [/How Search works/gi, "How OwO works"],
  [/I'm feeling \w+/gi, "I'm feeling OwO"],
];
var numTerms = replaceArry.length;
var txtWalker = document.createTreeWalker(
  document.body,
  NodeFilter.SHOW_TEXT,
  {
    acceptNode: function (node) {
      if (node.nodeValue.trim()) return NodeFilter.FILTER_ACCEPT;
      return NodeFilter.FILTER_SKIP;
    },
  },
  false,
);
var txtNode = null;

while ((txtNode = txtWalker.nextNode())) {
  var oldTxt = txtNode.nodeValue;

  for (var J = 0; J < numTerms; J++) {
    oldTxt = oldTxt.replace(replaceArry[J][0], replaceArry[J][1]);
  }
  txtNode.nodeValue = oldTxt;
}