Examine source code of Shopping Cart Share

{
  "manifest_version": 2,
  "name": "Shopping Cart Share",
  "version": "1.0.3",
  "description": "Build a unified cart from various retailers and seamlessly share its contents with anyone through a simple link.",
  "permissions": [
    "clipboardWrite",
    "storage",
    "unlimitedStorage",
    "webRequest",
    "webNavigation",
    "tabs",
    "activeTab",
    "cookies",
    "webRequestBlocking",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "/background/controller/background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "all_frames": true,
      "js": [
        "/content/reader.js"
      ],
      "matches": [
        "https://www.amazon.co.uk/gp/cart/view.html*",
        "https://www.amazon.sg/gp/cart/view.html*",
        "https://www.amazon.ca/gp/cart/view.html*",
        "https://www.amazon.it/gp/cart/view.html*",
        "https://www.amazon.nl/gp/cart/view.html*",
        "https://www.amazon.com/gp/cart/view.html*",
        "https://www.amazon.fr/gp/cart/view.html*",
        "https://www.amazon.de/gp/cart/view.html*",
        "https://www.amazon.es/gp/cart/view.html*",
        "https://www.amazon.cn/gp/cart/view.html*",
        "https://www.amazon.in/gp/cart/view.html*",
        "https://www.amazon.ae/gp/cart/view.html*",
        "https://www.amazon.com.br/gp/cart/view.html*",
        "https://www.amazon.com.tr/gp/cart/view.html*",
        "https://www.amazon.co.jp/gp/cart/view.html*",
        "https://www.amazon.com.mx/gp/cart/view.html*",
        "https://www.amazon.com.au/gp/cart/view.html*",
        "https://www.amazon.co.uk/gp/aw/c*",
        "https://www.amazon.sg/gp/aw/c*",
        "https://www.amazon.ca/gp/aw/c*",
        "https://www.amazon.it/gp/aw/c*",
        "https://www.amazon.nl/gp/aw/c*",
        "https://www.amazon.com/gp/aw/c*",
        "https://www.amazon.fr/gp/aw/c*",
        "https://www.amazon.de/gp/aw/c*",
        "https://www.amazon.es/gp/aw/c*",
        "https://www.amazon.cn/gp/aw/c*",
        "https://www.amazon.in/gp/aw/c*",
        "https://www.amazon.ae/gp/aw/c*",
        "https://www.amazon.com.br/gp/aw/c*",
        "https://www.amazon.com.tr/gp/aw/c*",
        "https://www.amazon.co.jp/gp/aw/c*",
        "https://www.amazon.com.mx/gp/aw/c*",
        "https://www.amazon.com.au/gp/aw/c*"
      ],
      "run_at": "document_start"
    },
    {
      "all_frames": true,
      "js": [
        "content/forwarder.js"
      ],
      "matches": [
        "https://shoppingcartshare.com/cart/receive/*"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_popup": "/page/view/popup/popup.html",
    "default_icon": "/resources/icons/share.png"
  },
  "options_ui": {
    "page": "/page/view/options/options.html",
    "browser_style": true
  },
  "icons": {
    "32": "/resources/icons/share.png",
    "64": "/resources/icons/share.png",
    "128": "/resources/icons/share.png"
  },
  "web_accessible_resources": [
    "/content/reader.js",
    "/content/forwarder.js"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0496ea4-f485-4a8d-9bd1-e9fcc3df4faf}"
    }
  }
}