Examine source code of Pixel Shooter Game

{
  "manifest_version": 2,
  "name": "Pixel Shooter Game",
  "version": "1.0",
  "description": "The utility can create a simple 2D shooting game, which has some features similar to the basic aspects of Pixel Gun Apocalypse 5 such as shooting, moving, and collecting experience points.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "128": "images/pixel-logo.png"
    }
  },
  "icons": {
    "128": "images/pixel-logo.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c947142-9a2e-4ed7-bb1a-6dd243c1ac43}"
    }
  }
}