Examine source code of NightCore

{
  "manifest_version": 3,
  "name": "NightCore",
  "version": "1.0",
  "description": "NightCore is a dark premium helper extension designed for internal demo and development testing.",
  "browser_specific_settings": {
    "gecko": {
      "id": "nightcore-addon@dongphutien.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "action": {
    "default_popup": "popup.html",
    "default_title": "NightCore"
  },
  "icons": {
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "permissions": []
}