Examine source code of Lights Out Puzzle

{
  "manifest_version": 2,
  "name": "Lights Out Puzzle",
  "description": "Switch every light off. Each press flips the cell and its four neighbours. Boards from 3x3 to 6x6, always solvable, with a hint that names the next useful press and your record for every numbered board.",
  "version": "8.2.1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{857cef61-3127-4e05-8b0b-0e6c3cc8023f}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "browser_action": {
    "default_title": "Lights Out Puzzle",
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png"
    }
  },
  "permissions": [
    "storage"
  ]
}