Examine source code of Guestbook Basic

{
  "manifest_version": 2,
  "name": "Guestbook Basic",
  "version": "1.0",
  "description": "We have written a code that generates a card with multiple input boxes and a submit button to store the guest’s information in the guestbook.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/book-logo.png"
    }
  },
  "icons": {
    "128": "images/book-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{52fb0ba6-a8df-4b19-baef-934ce67a01ae}"
    }
  }
}