Happy 8 Puzzle

A simple board game, where you need to arrange numbers in sequence
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Happy 8 Puzzle",
  "description": "A simple board game, where you need to arrange numbers in sequence",
  "version": "1.3",
  "manifest_version": 2,
  "author": "Kulin Choksi",
  "app": {
    "background": {
      "scripts": [
        "background.js"
      ]
    }
  },
  "permissions": [
    "storage"
  ],
  "icons": {
    "16": "icon-16.png",
    "128": "icon-128.png",
    "200": "icon-200.png"
  },
  "kiosk_enabled": true,
  "offline_enabled": true
}