---
title: "Feature: #78384 - Check ext tables TCA changes in install tool"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:feature-78384"
source: "Changelog/8.5/Feature-78384-CheckExtTablesTCAChangesInInstallTool.rst"
typo3-version: "8.5"
typo3-major: 8
type: "feature"
issue: 78384
forge: "https://forge.typo3.org/issues/78384"
tags: ["TCA", "Backend"]
rendered: "2026-09-25T23:17:45+00:00"
---

# Feature: #78384 - Check ext tables TCA changes in install tool {#feature-78384}

See [forge#78384](https://forge.typo3.org/issues/78384)

## Description {#description}

The install tool has a new feature to check extensions for `ext_tables.php` files that still change the global `TCA` array.

## Impact {#impact}

Changing the global `TCA` array in `ext_tables.php` is not allowed and can lead to failing or incomplete frontend requests.
The feature helps to find affected, loaded extensions.