Examine source code of Mission Capitals

{
  "manifest_version": 2,
  "name": "Mission Capitals",
  "version": "1.0",
  "description": "Opens the JetPunk World Capitals quiz at random times.",
  "permissions": [
    "alarms",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{59549846-e6cd-4914-9bab-f34db2c059f5}"
    }
  }
}