Examine source code of j-play

{
  "manifest_version": 3,
  "name": "j-play",
  "description": "Interact with a Jeopardy! game on the J-Archive website.",
  "version": "1.4.1",
  "icons": {
    "128": "images/128x128.png"
  },
  "content_scripts": [
    {
      "all_frames": false,
      "css": [
        "stylecontent.css"
      ],
      "js": [
        "contentscript.js"
      ],
      "matches": [
        "https://*.j-archive.com/showgame*"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [],
  "host_permissions": [
    "https://*.j-archive.com/showgame*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6edbebaa-f5ed-4445-9126-84514628f8eb}"
    }
  }
}