Monitor Text node change

monitorTextNode.js

var textNode = document.querySelector("$SELECTOR");

textNode.addEventListener("DOMCharacterDataModified", action, false);

function action(evt) {
   if($CONDITION) {
        window.open("http://www.google.com", "test" ,"modal=yes");
        window.focus();
        textNode.removeEventListener("DOMCharacterDataModified", action, false);
   }
}