Examine source code of Website color coding

{
  "manifest_version": 3,
  "name": "Website color coding",
  "version": "1.3.2",
  "description": "Helps to identify which environment you are working in.",
  "icons": {
    "256": "icon.png"
  },
  "background": {
    "scripts": [
      "service-worker.js"
    ],
    "persistent": false,
    "service_worker": "service-worker.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "main.js"
      ],
      "run_at": "document_end"
    }
  ],
  "action": {
    "default_title": "Add color coding to this website",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "options_page": "options.html",
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "website-color-coding@paans.net",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}