Tic Tac Toe - Cyberpunk Edition

A simple Tic Tac Toe game as a Firefox extension.
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manifest.json
{
  "manifest_version": 2,
  "name": "Tic Tac Toe",
  "version": "1.2",
  "description": "A simple Tic Tac Toe game as a Firefox extension.",
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icons/icon-48.png",
      "96": "icons/icon-96.png"
    }
  },
  "permissions": [
    "storage",
    "notifications"
  ],
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{8764a3b8-cb28-45f2-8bd0-b8fc1593a087}"
    }
  }
}