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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Simple typing tutor",
  "description": "Learn hand positioning on keyboard and practice to improve typing skill for accuracy and speed.",
  "version": "1",
  "app": {
    "urls": [
      "*://game.yathit.com/"
    ],
    "launch": {
      "web_url": "http://game.yathit.com/typing-tutor.html"
    }
  },
  "icons": {
    "128": "keyboard.png"
  },
  "permissions": []
}