Examine source code of Fire Balls 3D HTML5 Game

{
  "manifest_version": 2,
  "name": "Fire Balls 3D HTML5 Game",
  "version": "1.0",
  "description": "Fire Balls 3D HTML5 Game is extension Hold to shoot and avoid obstacles in Fire Balls 3D.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/fire-logo.png"
    }
  },
  "icons": {
    "128": "images/fire-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8bdc0833-299c-42f3-adf3-3aba5ed6111e}"
    }
  }
}