diff --git a/homeassistant/components/frontend/__init__.py b/homeassistant/components/frontend/__init__.py
index 066f5e1f224..c6812f4d9de 100644
--- a/homeassistant/components/frontend/__init__.py
+++ b/homeassistant/components/frontend/__init__.py
@@ -5,7 +5,6 @@ from collections.abc import Iterator
 from functools import lru_cache
 import json
 import logging
-import mimetypes
 import os
 import pathlib
 from typing import Any, TypedDict, cast
@@ -29,12 +28,6 @@ from homeassistant.loader import async_get_integration, bind_hass
 
 from .storage import async_setup_frontend_storage
 
-# Fix mimetypes for borked Windows machines
-# https://github.com/home-assistant/frontend/issues/3336
-mimetypes.add_type("text/css", ".css")
-mimetypes.add_type("application/javascript", ".js")
-
-
 DOMAIN = "frontend"
 CONF_THEMES = "themes"
 CONF_THEMES_MODES = "modes"