Examine source code of Arcade Classics

{
  "manifest_version": 3,
  "name": "Arcade Classics",
  "version": "2.2.7",
  "author": "Hugo Maxted, Mace Chettiyadan and Not Mario",
  "description": "Welcome to Arcade Classics - a free browser extension with 9 games to play!",
  "permissions": [
    "storage"
  ],
  "icons": {
    "256": "icon.png"
  },
  "action": {
    "default_icon": "icon.png",
    "default_popup": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a85731cd-97fd-4c70-8474-4746a91a6098}"
    }
  }
}