Lab2 Simple app

for test Hello, World!
Premium users can view and search full source code, and see the source code differences between two versions.
Upgrade to premium
manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Lab2 Simple app",
  "version": "1",
  "app": {
    "background": {
      "scripts": [
        "main.js"
      ]
    }
  },
  "icons": {
    "128": "icon.png"
  }
}