Examine source code of GreenTabs New Tab

{
  "name": "GreenTabs New Tab",
  "description": "GreenTabs New Tab",
  "version": "1.0",
  "permissions": [],
  "chrome_url_overrides": {
    "newtab": "pages/index.html"
  },
  "browser_action": {
    "default_icon": "img/logo_48x.png"
  },
  "background": {
    "scripts": [
      "browseraction_release.js"
    ]
  },
  "icons": {
    "16": "img/logo_16x.png",
    "48": "img/logo_48x.png",
    "128": "img/logo_128x.png"
  },
  "manifest_version": 2
}