Examine source code of Tawk Chatbot Popup

{
  "manifest_version": 2,
  "name": "Tawk Chatbot Popup",
  "version": "1.0",
  "description": "Popup to chat with Tawk.ai",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "tawkchatbot@example.com"
    }
  }
}