Examine source code of Amazon Cart to CSV

{
  "manifest_version": 2,
  "name": "Amazon Cart to CSV",
  "short_name": "Amazon Cart to CSV",
  "version": "1.0.0",
  "description": "Export your Amazon cart as a CSV file.",
  "author": "Osman Sayginer",
  "homepage_url": "https://sayginer.com",
  "browser_action": {
    "default_title": "Export Amazon Cart",
    "default_popup": "popup.html"
  },
  "permissions": [
    "downloads",
    "tabs",
    "activeTab",
    "storage",
    "https://amazon.com/*",
    "https://*.amazon.com/*",
    "https://amazon.co.uk/*",
    "https://*.amazon.co.uk/*",
    "https://amazon.de/*",
    "https://*.amazon.de/*",
    "https://amazon.fr/*",
    "https://*.amazon.fr/*",
    "https://amazon.it/*",
    "https://*.amazon.it/*",
    "https://amazon.es/*",
    "https://*.amazon.es/*",
    "https://amazon.ca/*",
    "https://*.amazon.ca/*",
    "https://amazon.co.jp/*",
    "https://*.amazon.co.jp/*",
    "https://amazon.com.au/*",
    "https://*.amazon.com.au/*",
    "https://amazon.in/*",
    "https://*.amazon.in/*",
    "https://amazon.nl/*",
    "https://*.amazon.nl/*",
    "https://amazon.com.mx/*",
    "https://*.amazon.com.mx/*",
    "https://amazon.com.br/*",
    "https://*.amazon.com.br/*",
    "https://amazon.ae/*",
    "https://*.amazon.ae/*",
    "https://amazon.sa/*",
    "https://*.amazon.sa/*",
    "https://amazon.se/*",
    "https://*.amazon.se/*",
    "https://amazon.pl/*",
    "https://*.amazon.pl/*",
    "https://amazon.sg/*",
    "https://*.amazon.sg/*",
    "https://amazon.com.tr/*",
    "https://*.amazon.com.tr/*",
    "https://amazon.com.be/*",
    "https://*.amazon.com.be/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "amazon2csv@sayginer.com",
      "strict_min_version": "91.0"
    }
  },
  "content_security_policy": "script-src 'self'; object-src 'self'"
}