Examine source code of Tab Close Gold

{
  "manifest_version": 3,
  "name": "Tab Close Gold",
  "version": "3.2.0.0",
  "permissions": [
    "tabs",
    "storage"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "description": "Tired of unwanted popups? Leftover launcher tabs got you down? Want a simple extension to auto close tabs? Then look no further!",
  "icons": {
    "128": "icon128.png"
  },
  "author": "mukunku",
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'"
  },
  "action": {
    "default_icon": {
      "128": "icon128.png"
    },
    "default_title": "Tab Close Gold",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "tabclosegold@mukunku.com",
      "strict_min_version": "109.0"
    }
  }
}