Metronome

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Metronome",
  "version": "1.0.0.1",
  "manifest_version": 2,
  "icons": {
    "128": "metronome_icon.png"
  },
  "description": "Use this free Metronome to improve your rhythmic state!",
  "app": {
    "urls": [
      "http://123metronome.com/?chromestore=1"
    ],
    "launch": {
      "web_url": "http://123metronome.com/?chromestore=1"
    }
  }
}