Examine source code of Credit Card Generator

{
  "manifest_version": 3,
  "name": "CC Generator",
  "description": "Generate valid test credit card numbers",
  "version": "2.1.0",
  "permissions": [
    "storage",
    "clipboardWrite"
  ],
  "action": {
    "default_popup": "html/popup.html",
    "default_icon": {
      "16": "images/icon16.png",
      "48": "images/icon48.png",
      "128": "images/icon128.png"
    }
  },
  "options_ui": {
    "page": "html/settings.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "cc-generator@crbanman.com",
      "strict_min_version": "121.0"
    }
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  }
}