Examine source code of Positive Thoughts

{
  "name": "Positive Thoughts",
  "desciption": "Get new positive thoughts on very click",
  "version": "0.0.1",
  "manifest_version": 2,
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "logo.png"
  },
  "icons": {
    "128": "logo.png"
  }
}