Examine source code of Open WhatsApp Chat

{
  "name": "Open Whatsapp Chat",
  "short_name": "open-whatsapp-chat",
  "description": "Select a phone number to start a WhatsApp chat with it",
  "homepage_url": "http://chrome.google.com/webstore",
  "version": "0.0.6",
  "manifest_version": 3,
  "default_locale": "en",
  "minimum_chrome_version": "88",
  "permissions": [
    "contextMenus",
    "storage",
    "notifications"
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "icons": {
    "128": "assets/img/128x128.png"
  },
  "action": {
    "default_icon": {
      "16": "assets/img/16x16.png",
      "24": "assets/img/24x24.png",
      "32": "assets/img/32x32.png"
    },
    "default_title": "Open Whatsapp Chat"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "open-whatsapp-chat@backslasher.net"
    }
  }
}