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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Hearts",
  "description": "Play the card game Hearts online for free. No sign-up or download necessary! Just get straight to playing!",
  "version": "0.0.0.1",
  "manifest_version": 2,
  "icons": {
    "128": "icon_128.png"
  },
  "app": {
    "launch": {
      "web_url": "http://www.thelogicgame.com/games/hearts/index.html"
    }
  }
}