Examine source code of Toolbar minute

{
  "manifest_version": 2,
  "name": "Toolbar minute",
  "version": "1.3",
  "description": "Displays a minute in the toolbar.",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "minute"
  },
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{47f30e57-aa78-4261-8ee7-d5251f74e9f8}"
    }
  }
}