Examine source code of Crack-The-Code Html

{
  "manifest_version": 2,
  "name": "Crack-The-Code Game Html",
  "version": "1.0",
  "description": "It is quite easy to develop with some simple mathematics. A player has to guess the 3 numbers in order to win this game by using 5 simple hints",
  "permissions": [],
  "browser_action": {
    "default_popup": "game.html",
    "default_icon": {
      "128": "images/track-logo.png"
    }
  },
  "icons": {
    "128": "images/track-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{15f636ff-deb2-48ff-b5e8-726090e10299}"
    }
  }
}