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manifest.json
{
  "update_url": "http://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Railroad Shunting Puzzle 2",
  "description": "Connect the locomatives and wagons and bring them each to their station.",
  "version": "1.0.0.1",
  "icons": {
    "128": "icon_128.png"
  },
  "app": {
    "urls": [
      "http://www.gamezhero.com/games/railroadshuntingpuzzle2?utm_campaign=chrome&utm_source=app&utm_medium=railroadshuntingpuzzle2"
    ],
    "launch": {
      "web_url": "http://www.gamezhero.com/games/railroadshuntingpuzzle2?utm_campaign=chrome&utm_source=launch&utm_medium=railroadshuntingpuzzle2"
    }
  }
}