undefined

manifest.json

{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "name": "Dentist Games at Duckie Deck",
  "description": "Are you afraid of the dentist? Now you can tame your fear and stand on the 'safe side' of the dental drill yourselves! This...",
  "version": "1.3",
  "manifest_version": 2,
  "app": {
    "urls": [
      "http://www.duckiedeck.com/play/dentist?ref=cws"
    ],
    "launch": {
      "web_url": "http://www.duckiedeck.com/play/dentist?ref=cws"
    }
  },
  "icons": {
    "128": "icon_128.png"
  },
  "permissions": [
    "notifications"
  ]
}