Examine source code of Zoho Bookings

{
  "version": "1.1.5",
  "manifest_version": 3,
  "name": "Zoho Bookings",
  "icons": {
    "16": "logo/16x16.png",
    "32": "logo/32x32.png",
    "64": "logo/64x64.png",
    "128": "logo/128x128.png"
  },
  "description": "An appointment scheduler that makes it easy to find the right time to connect with your customers.Scheduling made incredibly simple.",
  "action": {
    "default_icon": {
      "16": "logo/16x16.png",
      "32": "logo/32x32.png",
      "64": "logo/64x64.png",
      "128": "logo/128x128.png"
    },
    "default_title": "Zoho Bookings",
    "default_popup": "index.html"
  },
  "host_permissions": [
    "https://accounts.zoho.com/*",
    "https://accounts.zoho.eu/*",
    "https://accounts.zoho.in/*",
    "https://accounts.zoho.com.au/*",
    "https://accounts.zoho.com.cn/*",
    "https://accounts.zoho.jp/*",
    "https://accounts.localzoho.com/*",
    "https://bookings.zoho.com/*",
    "https://bookings.zoho.in/*",
    "https://bookings.zoho.eu/*",
    "https://bookings.zoho.com.au/*",
    "https://bookings.zoho.com.cn/*",
    "https://bookings.zoho.jp/*",
    "https://bookings.localzoho.com/*",
    "https://accounts.zoho.sa/*",
    "https://bookings.zoho.sa/*",
    "https://bookings.zohocloud.ca/*",
    "https://accounts.zohocloud.ca/*",
    "https://bookings.zoho.ae/*",
    "https://accounts.zoho.ae/*",
    "https://bookingslab.localzoho.com/*"
  ],
  "permissions": [
    "cookies",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://mail.google.com/*",
        "https://www.linkedin.com/*",
        "https://outlook.office365.com/*",
        "https://outlook.live.com/*"
      ],
      "js": [
        "assets/content-script.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "support@zohobookings.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "logo/64x64.png",
        "index.html"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "homepage_url": "https://www.zoho.com/bookings/"
}