diff --git a/components/com_ajax/ajax.php b/components/com_ajax/ajax.php
index 4c06d66bf8cf5..2232438c0029d 100644
--- a/components/com_ajax/ajax.php
+++ b/components/com_ajax/ajax.php
@@ -16,6 +16,7 @@
 use Joomla\CMS\Log\Log;
 use Joomla\CMS\Plugin\PluginHelper;
 use Joomla\CMS\Response\JsonResponse;
+use Joomla\CMS\String\StringableInterface;
 use Joomla\CMS\Table\Table;
 
 /*
@@ -205,15 +206,26 @@
 // Return the results in the desired format
 switch ($format) {
     case 'json':
-        // JSONinzed
-        echo new JsonResponse($results, null, false, $input->get('ignoreMessages', true, 'bool'));
+        if (!($results instanceof Throwable) && $results instanceof StringableInterface) {
+            echo $results;
+        } else {
+            if (\is_object($results) && !($results instanceof Throwable) && $results instanceof \Stringable) {
+                @trigger_error(
+                    'Ajax result object (except Throwable) which implements Stringable interface (implicitly or explicitly), will be rendered directly. Starting from 7.0',
+                    \E_USER_DEPRECATED
+                );
+            }
+
+            // JSONized
+            echo new JsonResponse($results, null, false, $input->get('ignoreMessages', true, 'bool'));
+        }
 
         break;
 
     default:
         // Handle as raw format
         // Output exception
-        if ($results instanceof Exception) {
+        if ($results instanceof Throwable) {
             // Log an error
             Log::add($results->getMessage(), Log::ERROR);
 
@@ -222,7 +234,7 @@
 
             // Echo exception type and message
             $out = \get_class($results) . ': ' . $results->getMessage();
-        } elseif (\is_scalar($results)) {
+        } elseif (\is_scalar($results) || $results instanceof StringableInterface) {
             // Output string/ null
             $out = (string) $results;
         } else {
diff --git a/libraries/src/String/StringableInterface.php b/libraries/src/String/StringableInterface.php
new file mode 100644
index 0000000000000..001488e076324
--- /dev/null
+++ b/libraries/src/String/StringableInterface.php
@@ -0,0 +1,31 @@
+<?php
+
+/**
+ * Joomla! Content Management System
+ *
+ * @copyright  (C) 2024 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\CMS\String;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * A transitioning interface to PHP implicit \Stringable interface
+ *
+ * @since  __DEPLOY_VERSION__
+ */
+interface StringableInterface
+{
+    /**
+     * To String magick.
+     *
+     * @return string
+     *
+     * @since  __DEPLOY_VERSION__
+     */
+    public function __toString(): string;
+}
diff --git a/plugins/editors/tinymce/src/Extension/TinyMCE.php b/plugins/editors/tinymce/src/Extension/TinyMCE.php
index 0dc33731ad865..6116faf3c00df 100644
--- a/plugins/editors/tinymce/src/Extension/TinyMCE.php
+++ b/plugins/editors/tinymce/src/Extension/TinyMCE.php
@@ -11,9 +11,11 @@
 namespace Joomla\Plugin\Editors\TinyMCE\Extension;
 
 use Joomla\CMS\Event\Editor\EditorSetupEvent;
+use Joomla\CMS\Event\Plugin\AjaxEvent;
 use Joomla\CMS\Language\Text;
 use Joomla\CMS\Plugin\CMSPlugin;
 use Joomla\CMS\Session\Session;
+use Joomla\CMS\String\StringableInterface;
 use Joomla\Database\DatabaseAwareTrait;
 use Joomla\Event\SubscriberInterface;
 use Joomla\Filesystem\Folder;
@@ -77,11 +79,21 @@ public function onEditorSetup(EditorSetupEvent $event)
      *
      * @since   5.0.0
      */
-    public function onAjaxTinymce()
+    public function onAjaxTinymce(AjaxEvent $event)
     {
+        // Create response object, with list of the templates
+        $response = new class () implements StringableInterface {
+            public $data = [];
+
+            public function __toString(): string
+            {
+                return json_encode($this->data);
+            }
+        };
+        $event->updateEventResult($response);
+
         if (!Session::checkToken('request')) {
-            echo json_encode([]);
-            exit();
+            return;
         }
 
         $this->loadLanguage();
@@ -91,8 +103,7 @@ public function onAjaxTinymce()
         $template  = $this->getApplication()->getInput()->getPath('template', '');
 
         if ('' === $template) {
-            echo json_encode([]);
-            exit();
+            return;
         }
 
         $filepaths = is_dir(JPATH_ROOT . '/templates/' . $template)
@@ -115,7 +126,7 @@ public function onAjaxTinymce()
             ];
         }
 
-        echo json_encode($templates);
-        exit();
+        // Add the list of templates to the response
+        $response->data = $templates;
     }
 }