Do background js scripts run on a different thread in Chrome OS apps?

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On the manifest for Chrome OS apps one must declare background js scripts.

{
  "name": "Hello World!",
  "description": "My first Chrome App.",
  "version": "0.1",
  "manifest_version": 2,
  "app": {
    "background": {
      "scripts": ["background.js"]
    }
  },
  "icons": { "16": "calculator-16.png", "128": "calculator-128.png" }
}

Are each of these running in their own thread?

Do they block each other or the JS threads running on the app windows?

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