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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  },
  "icons": {
    "128": "icon-128-NumberRack.png"
  },
  "manifest_version": 2,
  "name": "Number Rack, by The Math Learning Center",
  "short_name": "Number Rack",
  "description": "Develop number sense and explore addition and subtraction strategies.",
  "version": "3.0.1",
  "offline_enabled": true,
  "permissions": [
    "background",
    "clipboard",
    "clipboardWrite",
    "storage"
  ]
}