Examine source code of Share-A-Cart for Amazon

{
  "action": {
    "default_title": "Share-A-Cart for Amazon"
  },
  "background": {
    "scripts": [
      "/js/background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "@amazon-share-a-cart"
    }
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "/js/sac.js"
      ],
      "matches": [
        "https://*.share-a-cart.com/*"
      ],
      "run_at": "document_start"
    }
  ],
  "default_locale": "en",
  "description": "Share-A-Cart for Amazon allows you to share the contents of your cart with anyone else.",
  "host_permissions": [
    "https://www.share-a-cart.com/*",
    "https://crtsh.net/*",
    "https://www.amazon.com/*",
    "https://www.amazon.ca/*",
    "https://www.amazon.co.uk/*",
    "https://www.amazon.fr/*",
    "https://www.amazon.de/*",
    "https://www.amazon.it/*",
    "https://www.amazon.nl/*",
    "https://www.amazon.es/*",
    "https://www.amazon.cn/*",
    "https://www.amazon.in/*",
    "https://www.amazon.sg/*",
    "https://www.amazon.ae/*",
    "https://www.amazon.co.jp/*",
    "https://www.amazon.com.mx/*",
    "https://www.amazon.com.au/*",
    "https://www.amazon.com.br/*",
    "https://www.amazon.com.tr/*"
  ],
  "icons": {
    "16": "/images/sac-amazon-16.png",
    "64": "/images/sac-amazon-64.png",
    "128": "/images/sac-amazon-128.png"
  },
  "manifest_version": 3,
  "name": "Share-A-Cart for Amazon",
  "options_ui": {
    "open_in_tab": true,
    "page": "/options_page.html"
  },
  "permissions": [
    "alarms",
    "clipboardWrite",
    "storage",
    "unlimitedStorage",
    "tabs",
    "cookies",
    "activeTab",
    "scripting"
  ],
  "version": "3.1.8",
  "web_accessible_resources": [
    {
      "matches": [
        "<all_urls>"
      ],
      "resources": [
        "/images/*"
      ]
    }
  ]
}