Space invaders

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "Space invaders",
  "version": "1.3",
  "manifest_version": 2,
  "description": "The Old Space Invaders",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "none"
  ]
}