Examine source code of Yucata Status

{
  "manifest_version": 2,
  "name": "Yucata Status",
  "version": "0.4",
  "description": "An unofficial yucata.de status widget that links to your current turn.",
  "icons": {
    "48": "icons/grey.svg",
    "96": "icons/grey.svg"
  },
  "permissions": [
    "*://www.yucata.de/*",
    "alarms",
    "storage",
    "notifications",
    "idle"
  ],
  "browser_action": {
    "default_icon": "icons/grey.svg",
    "default_title": "Unknown status"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.yucata.de/*"
      ],
      "js": [
        "page.js"
      ]
    }
  ]
}