Examine source code of MangaBuddy Genre Filter

{
  "manifest_version": 3,
  "name": "MangaBuddy Genre Filter",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ]
      },
      "id": "mangabuddy-genre-filter@example.com"
    }
  },
  "description": "Hide items with unwanted genres",
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://mangabuddy.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mangabuddy.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_title": "Genre Filter"
  }
}