Examine source code of FL Assorted Cats

{
  "name": "FL Assorted Cats",
  "description": "Proudly display your feline companions in \"Fallen London\"!",
  "version": "3.3",
  "manifest_version": 3,
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "service_worker": "background.js",
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.fallenlondon.com/*"
      ],
      "js": [
        "bridge.js"
      ],
      "run_at": "document_start"
    },
    {
      "matches": [
        "https://www.fallenlondon.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/kitty-icon-16.png",
      "32": "/images/kitty-icon-32.png",
      "48": "/images/kitty-icon-48.png",
      "128": "/images/kitty-icon-128.png"
    }
  },
  "icons": {
    "16": "/images/kitty-icon-16.png",
    "32": "/images/kitty-icon-32.png",
    "48": "/images/kitty-icon-48.png",
    "128": "/images/kitty-icon-128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "inject.js",
        "presets.js"
      ],
      "matches": [
        "https://*.fallenlondon.com/*"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d5b3f6dd-da98-4b11-bcd2-8d043784c860}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}