Inject JS/CSS into tabs using the Chrome Extension API (continued) From http://stackoverflow.com/questions/6803840/chrome-extension-inject-javascript-into-a-webpage-to-perform-a-ajax-request

inject css or js extension

function exec(fn) {
    var script = document.createElement('script');
    script.setAttribute("type", "application/javascript");
    script.textContent = '(' + fn + ')();';
    document.body.appendChild(script); // run the script
    document.body.removeChild(script); // clean up
}

// with the below added to the manifest file

exec(function() {
    $("body").load('hacked.html');
});