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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "2D Runner ",
  "description": "It is a 2d runner. It is that simple.",
  "version": "0.1",
  "manifest_version": 2,
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  },
  "icons": {
    "16": "icon_16.png",
    "128": "icon_128.png"
  }
}