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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "default_locale": "en",
  "version": "2.4.14",
  "icons": {
    "128": "128.png"
  },
  "app": {
    "urls": [
      "http://www.chessmail.de/",
      "http://www.chessmail.eu/"
    ],
    "launch": {
      "web_url": "http://www.chessmail.eu/switchLanguageAuto.html"
    }
  }
}