Standalone WhatsApp Web

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Standalone WhatsApp Web",
  "version": "0.3.1",
  "description": "Open WhatsApp Web in a standalone popup window",
  "manifest_version": 3,
  "permissions": [
    "contextMenus",
    "tabs",
    "scripting"
  ],
  "background": {
    "service_worker": "background.js"
  },
  "content_scripts": [
    {
      "matches": [
        "https://web.whatsapp.com/"
      ],
      "js": [
        "contentScript.js"
      ],
      "all_frames": false
    }
  ],
  "host_permissions": [
    "https://web.whatsapp.com/"
  ],
  "icons": {
    "128": "assets/icon128.png"
  },
  "action": {
    "default_icon": {
      "128": "assets/icon128.png"
    },
    "default_title": "Standalone WhatsApp Web"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Alt+W"
      }
    }
  }
}