---
title: "Breaking: #78522 - Removed backend user option debugInWindow"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:breaking-78522"
source: "Changelog/8.5/Breaking-78522-RemoveBackendUserOptionDebugInWindow.rst"
typo3-version: "8.5"
typo3-major: 8
type: "breaking"
issue: 78522
forge: "https://forge.typo3.org/issues/78522"
tags: ["Backend", "JavaScript"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Breaking: #78522 - Removed backend user option debugInWindow {#breaking-78522}

See [forge#78522](https://forge.typo3.org/issues/78522)

## Description {#description}

The backend user option `debugInWindow` was unused in the core and has been removed,
as the option of opening the debug information in a window was migrated already.

## Impact {#impact}

The setting is not available anymore in JavaScript under `TYPO3.configuration`.

## Affected Installations {#affected-installations}

Any installation that uses the removed backend user option `debugInWindow`.