Stupid script with a typo

1031.user.js

// ==UserScript==
// @name           Stupid script with a typo
// @include        http://*/*
// ==/UserScript==

function filterNode(node)
{
    switch (node.nodeType)
    {
        case Node.ELEMENT_NODE:
            filterElement(node);
            break;

        case Node.TEXT_NODE:
            filterTextNode(node);
            break;
    }
}

function filterTextNode(node)
{
    node.data = node.data.replace(/keyboard/ig, "leopard");
}

function filterElement(element)
{
    Array.prototype.forEach.call(element.childNodes, filterNode);
}

filterElement(document);

document.addEventListener('DOMNodeInserted', function(e) {
    filterNode(e.target);
}, false);