Examine source code of Analog Clock

{
  "description": "Simple analog clock on toolbar",
  "name": "Analog Clock",
  "version": "1.7resigned1",
  "manifest_version": 2,
  "applications": {
    "gecko": {
      "id": "anaclock@mozilla.org"
    }
  },
  "browser_action": {
    "default_popup": "options.html"
  },
  "background": {
    "page": "anaclock.html"
  },
  "permissions": [
    "storage"
  ]
}