diff --git a/ChangeLog b/ChangeLog
index a02dc13bd..bf5b14d8f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@ ChangeLog
 Upcoming version
 [TASK]    Switch to PHP based rendering for documentation. Thanks to Chris Müller. https://github.com/tpwd/ke_search/pull/265
 [TASK]    Migrate outdated TCA configurations in FlexForms. https://github.com/tpwd/ke_search/issues/264
+[TASK]    Migrate usage of $GLOBALS['TSFE']->tmpl for TYPO3 13. https://github.com/tpwd/ke_search/issues/258
 
 Version 6.1.3, 20 December 2024
 [FEATURE] Show additional fields which are registered by other extensions in "Indexed content" function of the backend module
diff --git a/Classes/Lib/SearchHelper.php b/Classes/Lib/SearchHelper.php
index 46a0743e7..91f08efd0 100644
--- a/Classes/Lib/SearchHelper.php
+++ b/Classes/Lib/SearchHelper.php
@@ -76,13 +76,13 @@ public static function getExtConf()
         } else {
             $extConf['prePostTagChar'] = '#';
         }
-        $extConf['multiplyValueToTitle'] = ($extConf['multiplyValueToTitle']) ? $extConf['multiplyValueToTitle'] : 1;
-        $extConf['searchWordLength'] = ($extConf['searchWordLength']) ? $extConf['searchWordLength'] : 4;
+        $extConf['multiplyValueToTitle'] = $extConf['multiplyValueToTitle'] ?: 1;
+        $extConf['searchWordLength'] = $extConf['searchWordLength'] ?: 4;
 
         // override extConf with TS Setup
-        if (is_array($GLOBALS['TSFE']->tmpl->setup['ke_search.']['extconf.']['override.'] ?? null)
-            && count($GLOBALS['TSFE']->tmpl->setup['ke_search.']['extconf.']['override.'])) {
-            foreach ($GLOBALS['TSFE']->tmpl->setup['ke_search.']['extconf.']['override.'] as $key => $value) {
+        $typoScriptSetup = self::getTypoScriptSetup();
+        if (count($typoScriptSetup['ke_search.']['extconf.']['override.'] ?? [])) {
+            foreach ($typoScriptSetup['ke_search.']['extconf.']['override.'] as $key => $value) {
                 $extConf[$key] = $value;
             }
         }
@@ -112,9 +112,9 @@ public static function getExtConfPremium()
         }
 
         // override extConfPremium with TS Setup
-        if (is_array($GLOBALS['TSFE']->tmpl->setup['ke_search_premium.']['extconf.']['override.'] ?? null)
-            && count($GLOBALS['TSFE']->tmpl->setup['ke_search_premium.']['extconf.']['override.'])) {
-            foreach ($GLOBALS['TSFE']->tmpl->setup['ke_search_premium.']['extconf.']['override.'] as $key => $value) {
+        $typoScriptSetup = self::getTypoScriptSetup();
+        if (count($typoScriptSetup['ke_search_premium.']['extconf.']['override.'] ?? [])) {
+            foreach ($typoScriptSetup['ke_search_premium.']['extconf.']['override.'] as $key => $value) {
                 $extConfPremium[$key] = $value;
             }
         }
@@ -509,7 +509,8 @@ public static function getAllowedPiVars($additionalAllowedPiVars = ''): array
      */
     public static function getSearchWordParameter(): string
     {
-        return htmlspecialchars($GLOBALS['TSFE']->tmpl->setup['plugin.']['tx_kesearch_pi1.']['searchWordParameter'] ?? 'tx_kesearch_pi1[sword]');
+        $typoScriptSetup = self::getTypoScriptSetup();
+        return htmlspecialchars($typoScriptSetup['plugin.']['tx_kesearch_pi1.']['searchWordParameter'] ?? 'tx_kesearch_pi1[sword]');
     }
 
     /**
@@ -534,4 +535,21 @@ public static function rmFromList($element, $list)
         }
         return implode(',', $items);
     }
+
+    public static function getTypoScriptSetup(): array
+    {
+        $request = self::getRequest();
+        if ($request === null) {
+            return [];
+        }
+        if (ApplicationType::fromRequest($request)->isBackend()) {
+            return [];
+        }
+        return $request->getAttribute('frontend.typoscript')->getSetupArray();
+    }
+
+    private static function getRequest(): ?ServerRequestInterface
+    {
+        return $GLOBALS['TYPO3_REQUEST'] ?? null;
+    }
 }
diff --git a/Documentation/Configuration/Notes.rst b/Documentation/Configuration/Notes.rst
index a5cc4c2af..0d2b9124c 100755
--- a/Documentation/Configuration/Notes.rst
+++ b/Documentation/Configuration/Notes.rst
@@ -25,14 +25,15 @@ or you can define the result page with help of an URL param if you want:
 Notes on TypoScript and extension configuration
 ===============================================
 
-In :guilabel:`Admin Tools` > :guilabel:`Settings` > :guilabel:`Extension Configuration` you can define basic options
+In :guilabel:`Admin Tools` > :guilabel:`Settings` >
+:guilabel:`Extension Configuration` you can define basic options
 like the minimal length of searchwords.
 
 You can overwrite this configuration in your page TypoScript setup:
 
 .. code-block:: typoscript
 
-   ke_search_premium.extconf.override.searchWordLength = 3
+   ke_search.extconf.override.searchWordLength = 3
 
 or