Examine source code of Nested Chat Comments

{
  "manifest_version": 2,
  "name": "Nested Chat Comments",
  "version": "1.0",
  "description": "Nested Comments Chat. We must have seen it on social media like Facebook, Instagram, Youtube, Twitter, etc. We have seen the use of the nested comment in the comment section of these social sites.",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/rep-logo.png"
    }
  },
  "icons": {
    "128": "images/rep-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{21a491a2-2151-4e76-a204-e233d2cc2f51}"
    }
  }
}