Examine source code of Duck Buddy

{
  "update_url" : "https://clients2.google.com/service/update2/crx" ,
  "manifest_version" : 3 ,
  "name" : "Duck Buddy",
  "version" : "2.9.2",
  "description" : "A tiny duck randomly waddles out of your tab edges, quacks, and bolts. Catch it to grow your flock!",
  "permissions" : [
    "storage" ,
    "scripting" 
  ],
  "host_permissions" : [
    "<all_urls>" 
  ],
  "background" : {
    "service_worker" : "bg.js" 
  },
  "action" : {
    "default_popup" : "popup.html",
    "default_title" : "Duck Buddy",
    "default_icon" : {
      "16" : "icons/icon16.png",
      "48" : "icons/icon48.png",
      "128" : "icons/icon128.png"
    }
  },
  "options_ui" : {
    "page": "options.html" ,
    "open_in_tab": true
  },
  "icons" : {
    "16" : "icons/icon16.png",
    "48" : "icons/icon48.png",
    "128" : "icons/icon128.png"
  },
  "web_accessible_resources" : [
    {
      "resources" : [
        "assets/quack.mp3" 
      ],
      "matches" : [
        "<all_urls>" 
      ]
    }
  ],
  "content_scripts" : [
    {
      "matches" : [
        "<all_urls>" 
      ],
      "js" : [
        "ducks.js" ,
        "content.js" 
      ],
      "css" : [
        "duck.css" 
      ],
      "run_at" : "document_idle" 
    }
  ]
}