{
"manifest_version": 2,

"name": "Name",
"description": "Description",
"version": "1.0",

"browser_action": {
    "name": "Manipulate DOM",
    "icons": ["icon.png"],
    "default_icon": "icon.png",
    "default_popup": "index.html"
},
"content_scripts": [ {
    "js": [ "jquery.min.js", "custom.js" ],
    "matches": [ "http://*/*", "https://*/*"]
  }],
"permissions": [
    "activeTab", "tabs", "<all_urls>", "webRequest "
]}

function hello() {
chrome.tabs.executeScript({
    file: 'alert.js'
});
}
document.getElementById('clickme').addEventListener('click', hello);

$('input[name="firstname"]').val('Alex');
$('input[name="lastname"]').val('Jefferson');
$('button[name="submit"]').trigger('click');