diff --git a/typo3/sysext/core/Classes/Configuration/ConfigurationManager.php b/typo3/sysext/core/Classes/Configuration/ConfigurationManager.php
index 4babe106691f5083bbd2a110861440df566eebee..d35541b8d3055df26895d6801e154f7f82aec64c 100644
--- a/typo3/sysext/core/Classes/Configuration/ConfigurationManager.php
+++ b/typo3/sysext/core/Classes/Configuration/ConfigurationManager.php
@@ -76,6 +76,7 @@ class ConfigurationManager
         'EXTCONF',
         'DB',
         'SYS/caching/cacheConfigurations',
+        'EXTENSIONS',
     ];
 
     /**
diff --git a/typo3/sysext/core/Configuration/DefaultConfiguration.php b/typo3/sysext/core/Configuration/DefaultConfiguration.php
index 01b4d1e90818414710d998e5f4fc0431a07beda7..c9dc2fb2af006a51c6ffe89bb9ed9582f9d4bd03 100644
--- a/typo3/sysext/core/Configuration/DefaultConfiguration.php
+++ b/typo3/sysext/core/Configuration/DefaultConfiguration.php
@@ -16,7 +16,7 @@
  * This file contains the default array definition that is
  * later populated as $GLOBALS['TYPO3_CONF_VARS']
  *
- * The description of the various options is stored in the DefaultConfigurationDescription.php file
+ * The description of the various options is stored in the DefaultConfigurationDescription.yaml file
  */
 return [
     'GFX' => [ // Configuration of the image processing features in TYPO3. 'IM' and 'GD' are short for ImageMagick and GD library respectively.
@@ -1125,5 +1125,5 @@ return [
             'update' => [],
         ],
     ],
-    'SVCONF' => []
+    'SVCONF' => [],
 ];
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Deprecation-82254-DeprecateGLOBALSTYPO3_CONF_VARSEXTextConf.rst b/typo3/sysext/core/Documentation/Changelog/master/Deprecation-82254-DeprecateGLOBALSTYPO3_CONF_VARSEXTextConf.rst
index 4ecae44100c281664ecea80c07667076b47aad61..ee96a3ab7a46f33cc2badee796141f0c8f9e9e26 100644
--- a/typo3/sysext/core/Documentation/Changelog/master/Deprecation-82254-DeprecateGLOBALSTYPO3_CONF_VARSEXTextConf.rst
+++ b/typo3/sysext/core/Documentation/Changelog/master/Deprecation-82254-DeprecateGLOBALSTYPO3_CONF_VARSEXTextConf.rst
@@ -9,7 +9,7 @@ See :issue:`82254`
 Description
 ===========
 
-The extension configuration stored in $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'] has been deprecated and replaced by a plain array in $GLOBALS['TYPO3_CONF_VARS']['EXTCONF'].
+The extension configuration stored in $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'] has been deprecated and replaced by a plain array in $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'].
 
 
 Affected Installations
@@ -21,6 +21,6 @@ All extensions manually getting settings and unserializing them from $GLOBALS['T
 Migration
 =========
 
-Switch to the use of $GLOBALS['TYPO3_CONF_VARS']['EXTCONF'] instead and remove all unserialize calls.
+Switch to the use of $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'] instead and remove all unserialize calls.
 
-.. index:: LocalConfiguration, PHP-API, FullyScanned
\ No newline at end of file
+.. index:: LocalConfiguration, PHP-API, FullyScanned
diff --git a/typo3/sysext/core/Documentation/Changelog/master/Feature-82254-StoreExtensionConfigurationAsPlainArray.rst b/typo3/sysext/core/Documentation/Changelog/master/Feature-82254-StoreExtensionConfigurationAsPlainArray.rst
index 9af5bfb77410e04b1b62b1a487cd0e9ccbc4f7ee..4e12dbd226e41f859328498aa2ba9e98f8bb46b7 100644
--- a/typo3/sysext/core/Documentation/Changelog/master/Feature-82254-StoreExtensionConfigurationAsPlainArray.rst
+++ b/typo3/sysext/core/Documentation/Changelog/master/Feature-82254-StoreExtensionConfigurationAsPlainArray.rst
@@ -11,7 +11,7 @@ Description
 
 There is no reason to save the extension configuration as serialized values instead of an plain array. Arrays are easier to handle and there are already parts of the core using arrays (for example the avatar provider registration).
 
-Therefore the API has been changed to store the extension configuration as an array in $GLOBALS['TYPO3_CONF_VARS']['EXTCONF']. The configuration is merged on save with the default configuration and the full configuration is written to LocalConfiguration.
+Therefore the API has been changed to store the extension configuration as an array in $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']. The configuration is merged on save with the default configuration and the full configuration is written to LocalConfiguration.
 
 
 Impact
@@ -19,4 +19,4 @@ Impact
 
 Extension configuration can now be accessed as array directly, without calling unserialize(). The old and new API will co-exist in version 9.
 
-.. index:: LocalConfiguration, PHP-API
\ No newline at end of file
+.. index:: LocalConfiguration, PHP-API
diff --git a/typo3/sysext/extensionmanager/Classes/Utility/ConfigurationUtility.php b/typo3/sysext/extensionmanager/Classes/Utility/ConfigurationUtility.php
index d52ae1649daccf0bff97de213660092ab5e53204..1f3600c66886acbf4055eb6291f9102b1ce7ead5 100644
--- a/typo3/sysext/extensionmanager/Classes/Utility/ConfigurationUtility.php
+++ b/typo3/sysext/extensionmanager/Classes/Utility/ConfigurationUtility.php
@@ -67,7 +67,7 @@ class ConfigurationUtility implements \TYPO3\CMS\Core\SingletonInterface
         /** @var $configurationManager \TYPO3\CMS\Core\Configuration\ConfigurationManager */
         $configurationManager = $this->objectManager->get(\TYPO3\CMS\Core\Configuration\ConfigurationManager::class);
         $configurationManager->setLocalConfigurationValueByPath('EXT/extConf/' . $extensionKey, serialize($configuration));
-        $configurationManager->setLocalConfigurationValueByPath('EXTCONF/' . $extensionKey, $configuration);
+        $configurationManager->setLocalConfigurationValueByPath('EXTENSIONS/' . $extensionKey, $configuration);
     }
 
     /**
@@ -80,14 +80,14 @@ class ConfigurationUtility implements \TYPO3\CMS\Core\SingletonInterface
     {
         $mergedConfiguration = $this->getDefaultConfigurationFromExtConfTemplateAsValuedArray($extensionKey);
 
-        // @deprecated loading serialized configuration is deprecated and will be removed in v10 - use EXTCONF array instead
+        // @deprecated loading serialized configuration is deprecated and will be removed in v10 - use EXTENSIONS array instead
         // No objects allowed in extConf at all - it is safe to deny that during unserialize()
         $legacyCurrentExtensionConfiguration = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extensionKey], ['allowed_classes' => false]);
         $legacyCurrentExtensionConfiguration = is_array($legacyCurrentExtensionConfiguration) ? $legacyCurrentExtensionConfiguration : [];
         $mergedConfiguration = $this->mergeExtensionConfigurations($mergedConfiguration, $legacyCurrentExtensionConfiguration);
 
-        if (isset($GLOBALS['TYPO3_CONF_VARS']['EXTCONF'][$extensionKey]) && is_array($GLOBALS['TYPO3_CONF_VARS']['EXTCONF'][$extensionKey])) {
-            $currentExtensionConfiguration = $GLOBALS['TYPO3_CONF_VARS']['EXTCONF'][$extensionKey];
+        if (isset($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey]) && is_array($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey])) {
+            $currentExtensionConfiguration = $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey];
             $mergedConfiguration = $this->mergeExtensionConfigurations($mergedConfiguration, $currentExtensionConfiguration);
         }
 
diff --git a/typo3/sysext/extensionmanager/Tests/Unit/Utility/ConfigurationUtilityTest.php b/typo3/sysext/extensionmanager/Tests/Unit/Utility/ConfigurationUtilityTest.php
index ecbe829081f444dcc3a244082ff1eec28d5cb365..54c5f40d8fde454b53af4bd168cee4f8a0933582 100644
--- a/typo3/sysext/extensionmanager/Tests/Unit/Utility/ConfigurationUtilityTest.php
+++ b/typo3/sysext/extensionmanager/Tests/Unit/Utility/ConfigurationUtilityTest.php
@@ -95,7 +95,7 @@ class ConfigurationUtilityTest extends \TYPO3\TestingFramework\Core\Unit\UnitTes
         ];
 
         $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'][$extensionKey] = serialize($serializedConfiguration);
-        $GLOBALS['TYPO3_CONF_VARS']['EXTCONF'][$extensionKey] = $currentExtconfConfiguration;
+        $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS'][$extensionKey] = $currentExtconfConfiguration;
         $actual = $configurationUtility->getCurrentConfiguration($extensionKey);
         $this->assertEquals($expected, $actual);
     }