diff --git a/public/script.js b/public/script.js
index 6b80b330c..73314902d 100644
--- a/public/script.js
+++ b/public/script.js
@@ -145,7 +145,7 @@ import {
     Stopwatch,
 } from './scripts/utils.js';
 
-import { ModuleWorkerWrapper, doDailyExtensionUpdatesCheck, extension_settings, getContext, loadExtensionSettings, processExtensionHelpers, registerExtensionHelper, renderExtensionTemplate, runGenerationInterceptors, saveMetadataDebounced } from './scripts/extensions.js';
+import { ModuleWorkerWrapper, doDailyExtensionUpdatesCheck, extension_settings, getContext, loadExtensionSettings, renderExtensionTemplate, runGenerationInterceptors, saveMetadataDebounced } from './scripts/extensions.js';
 import { COMMENT_NAME_DEFAULT, executeSlashCommands, getSlashCommandsHelp, processChatSlashCommands, registerSlashCommand } from './scripts/slash-commands.js';
 import {
     tag_map,
@@ -338,8 +338,6 @@ export const event_types = {
 
 export const eventSource = new EventEmitter();
 
-eventSource.on(event_types.MESSAGE_RECEIVED, processExtensionHelpers);
-eventSource.on(event_types.MESSAGE_SENT, processExtensionHelpers);
 eventSource.on(event_types.CHAT_CHANGED, processChatSlashCommands);
 
 const characterGroupOverlay = new BulkEditOverlay();
@@ -7164,7 +7162,10 @@ window['SillyTavern'].getContext = function () {
         saveReply,
         registerSlashCommand: registerSlashCommand,
         executeSlashCommands: executeSlashCommands,
-        registerHelper: registerExtensionHelper,
+        /**
+         * @deprecated Handlebars for extensions are no longer supported.
+         */
+        registerHelper: () => {},
         registedDebugFunction: registerDebugFunction,
         renderExtensionTemplate: renderExtensionTemplate,
         callPopup: callPopup,
diff --git a/public/scripts/extensions.js b/public/scripts/extensions.js
index 3ce240060..120791842 100644
--- a/public/scripts/extensions.js
+++ b/public/scripts/extensions.js
@@ -47,8 +47,6 @@ export function saveMetadataDebounced() {
     }, 1000);
 }
 
-export const extensionsHandlebars = Handlebars.create();
-
 /**
  * Provides an ability for extensions to render HTML templates.
  * Templates sanitation and localization is forced.
@@ -61,40 +59,6 @@ export function renderExtensionTemplate(extensionName, templateId, templateData
     return renderTemplate(`scripts/extensions/${extensionName}/${templateId}.html`, templateData, sanitize, localize, true);
 }
 
-/**
- * Registers a Handlebars helper for use in extensions.
- * @param {string} name Handlebars helper name
- * @param {function} helper Handlebars helper function
- */
-export function registerExtensionHelper(name, helper) {
-    extensionsHandlebars.registerHelper(name, helper);
-}
-
-/**
- * Applies handlebars extension helpers to a message.
- * @param {number} messageId Message index in the chat.
- */
-export function processExtensionHelpers(messageId) {
-    const context = getContext();
-    const message = context.chat[messageId];
-
-    if (!message?.mes || typeof message.mes !== 'string') {
-        return;
-    }
-
-    // Don't waste time if there are no mustaches
-    if (!substituteParams(message.mes).includes('{{')) {
-        return;
-    }
-
-    try {
-        const template = extensionsHandlebars.compile(substituteParams(message.mes), { noEscape: true });
-        message.mes = template({});
-    } catch {
-        // Ignore
-    }
-}
-
 // Disables parallel updates
 class ModuleWorkerWrapper {
     constructor(callback) {