Examine source code of Page Destroyer Game

{
  "manifest_version": 3,
  "name": "Page Destroyer",
  "version": "2.0",
  "description": "Smash, blast, and burn any webpage for instant stress relief!",
  "browser_specific_settings": {
    "gecko": {
      "id": "page-destroyer@extension",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_title": "Destroy this page!",
    "default_icon": {
      "16": "icon16.png",
      "32": "icon32.png",
      "48": "icon48.png",
      "128": "icon128.png"
    }
  },
  "icons": {
    "16": "icon16.png",
    "32": "icon32.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "toolbar.css",
        "content.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}