Examine source code of Target Practice

{
  "manifest_version": 2,
  "name": "Target Practice",
  "description": "Click the dots as fast as you can: three difficulty levels, shrinking targets on hard, full stats after every round.",
  "version": "2.8",
  "browser_specific_settings": {
    "gecko": {
      "id": "{0be5ba26-cbec-4100-88a4-1061c56e729d}",
      "strict_min_version": "101.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "32": "assets/icon-32.png",
    "48": "assets/icon-48.png",
    "64": "assets/icon-64.png",
    "96": "assets/icon-96.png",
    "128": "assets/icon-128.png"
  },
  "permissions": [
    "storage"
  ],
  "browser_action": {
    "default_title": "Target Practice",
    "default_popup": "scripts/popup.html",
    "default_icon": {
      "32": "assets/icon-32.png",
      "48": "assets/icon-48.png",
      "64": "assets/icon-64.png",
      "96": "assets/icon-96.png",
      "128": "assets/icon-128.png"
    }
  }
}