Examine source code of Codenames Assistant

{
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "codenames-assistant@lukesrw"
    }
  },
  "content_scripts": [
    {
      "js": [
        "js/script.js"
      ],
      "matches": [
        "https://codenames.game/room/*"
      ]
    }
  ],
  "description": "Codenames Assistant",
  "developer": {
    "name": "Luke Wilson",
    "url": "https://github.com/lukesrw/codenames-assistant/"
  },
  "icons": {
    "16": "img/logo-16.png",
    "32": "img/logo-32.png",
    "48": "img/logo-48.png",
    "64": "img/logo-64.png",
    "96": "img/logo-96.png",
    "128": "img/logo-128.png"
  },
  "manifest_version": 2,
  "name": "Codenames Assistant",
  "permissions": [
    "notifications"
  ],
  "version": "1.2"
}