christianwish/manifest.json

## manifest.json
{
  "name": "inject script",
  "description": "",
  "version": "1.0",
  "permissions": [
    "tabs", "http://*/*", "https://*/*"
  ],
  "browser_action": {
      "default_title": "Set this page's color.",
      "default_icon": "icon.png",
      "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "web_accessible_resources": ["script.js"]
}

## popup.html

<!doctype html>
<html>
  <head>
    <title>Set Page Color Popup</title>
    <style>
    body {
      overflow: hidden;
      margin: 0px;
      padding: 0px;
      background: white;
    }
    </style>
    <script src="popup.js"></script>
  </head>
  <body>
    <button id="inject">inject</button>
  </body>
</html>

## popup.js
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

function insert() {
	chrome.tabs.query({
	    active: true,
	    lastFocusedWindow: true
	}, function(tabs) {
	    // and use that tab to fill in out title and url
	    var tab = tabs[0];
	    chrome.tabs.executeScript(tab.ib, {
			file: 'script.js'
		});

	});


}

function click(e) {
  insert();
}

document.addEventListener('DOMContentLoaded', function () {
  var button = document.querySelectorAll('#inject');
    button.addEventListener('click', click);
});

## script.js
(function() {

	// just place a div at top right
	var div = document.createElement('div');
	div.style.position = 'fixed';
	div.style.top = 0;
	div.style.right = 0;
	div.textContent = 'Injected!';
	document.body.appendChild(div);

	alert('inserted self... giggity');

})();
	{
	"name": "inject script",
	"description": "",
	"version": "1.0",
	"permissions": [
	"tabs", "http:///", "https:///"
	],
	"browser_action": {
	"default_title": "Set this page's color.",
	"default_icon": "icon.png",
	"default_popup": "popup.html"
	},
	"manifest_version": 2,
	"web_accessible_resources": ["script.js"]
	}
	(function() {

	// just place a div at top right
	var div = document.createElement('div');
	div.style.position = 'fixed';
	div.style.top = 0;
	div.style.right = 0;
	div.textContent = 'Injected!';
	document.body.appendChild(div);

	alert('inserted self... giggity');

	})();