How to search a website for specific word using JavaScript?

I'm creating an extension for Chrome which will search for a certain phrase/word on the website. How can I do this with JavaScript? I tried many solutions I found on the Internet, but none of them works.

Code: https://www.dropbox.com/sh/0d38od48qhpdhhf/AAD7sYee6KDa5jUD1TIgg0d4a?dl=0

 

https://jsfiddle.net/hm659mkd/1/

<div id="test"><h1>Some Stuff</h1></div>
<div class="woot woory what">ok what now?</div>
<div id="ok">findme i bet you cant!</div>

HTML:

var word = "findme",
    queue = [document.body],
    curr
;
while (curr = queue.pop()) {
    if (!curr.textContent.match(word)) continue;
    for (var i = 0; i < curr.childNodes.length; ++i) {
        switch (curr.childNodes[i].nodeType) {
            case Node.TEXT_NODE :
                if (curr.childNodes[i].textContent.match(word)) {
                    alert("Found!");
                }
                break;
            case Node.ELEMENT_NODE :
                queue.push(curr.childNodes[i]);
                break;
        }
    }
}

Code (JavaScript):

 

I would guess you'll need node.js to do that, not client side javascript.