Examine source code of Tdo

{
  "manifest_version": 2,
  "name": "Tdo",
  "version": "1.0.2",
  "description": "Simple todo extension for mozilla",
  "icons": {
    "48": "icons/tdo-48.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_icon": {
      "48": "icons/tdo-48.png"
    },
    "default_title": "Tdo",
    "default_popup": "popup/tdo.html"
  }
}