Examine source code of Maximize WhatsApp™ Web

{
  "manifest_version": 2,
  "name": "Maximize WhatsApp™ Web",
  "version": "2.5",
  "description": "Enable full viewport for large aspect ratio screens on WhatsApp™ Web.",
  "icons": {
    "16": "icons/maximize-whatsapp-web-icon-16.png",
    "48": "icons/maximize-whatsapp-web-icon-48.png",
    "128": "icons/maximize-whatsapp-web-icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/*"
      ],
      "js": [
        "main.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{4e70c430-fbeb-48f7-b13b-c734b499f828}"
    }
  }
}