My first app

Hello World!

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "My first app",
  "version": "1",
  "app": {
    "background": {
      "scripts": [
        "main.js"
      ]
    }
  }
}