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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "JJ Jumper",
  "description": "Jump and run",
  "version": "1.0",
  "manifest_version": 2,
  "app": {
    "launch": {
      "local_path": "main.html"
    }
  },
  "icons": {
    "16": "icon_16.png",
    "128": "icon_128.png"
  }
}