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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Quick addition",
  "description": "An addition game. Calculate the sum of the colored cells as quickly as possible.",
  "version": "2.0.3",
  "manifest_version": 2,
  "icons": {
    "128": "icon_128.png"
  },
  "app": {
    "urls": [
      "http://www.gleefulgames.com/games/addition.html"
    ],
    "launch": {
      "web_url": "http://www.gleefulgames.com/games/addition.html"
    }
  }
}