Examine source code of YouTube CeresFaunafy

{
  "manifest_version": 2,
  "name": "YouTube CeresFaunafy",
  "version": "1.4",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "description": "Modify YouTube thumbnails to include the Hololive VTuber Fauna",
  "permissions": [
    "https://www.youtube.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "js": [
        "ceresfaunafy.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    "images/*.png",
    "images/*.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bfa467a4-9a09-4a6c-9984-c689d823a91e}"
    }
  }
}