Don't use aiofiles. It's anoying to install in docker

custom_components/browser_mod/manifest.json

@@ -4,5 +4,5 @@
   "documentation": "",
   "dependencies": ["websocket_api", "http"],
   "codeowners": [],
-  "requirements": ["aiofiles"]
+  "requirements": []
 }

custom_components/browser_mod/mod_view.py

@@ -1,5 +1,4 @@
 from aiohttp import web
-import aiofiles
 from homeassistant.components.http import HomeAssistantView
 
 from .const import FRONTEND_SCRIPT_URL, DATA_EXTRA_MODULE_URL
@@ -28,8 +27,8 @@ class ModView(HomeAssistantView):
         filecontent = ""
 
         try:
-            async with aiofiles.open(path, mode="r", encoding="utf-8", errors="ignore") as localfile:
-                filecontent = await localfile.read()
+            with open(path, mode="r", encoding="utf-8", errors="ignore") as localfile:
+                filecontent = localfile.read()
                 localfile.close()
         except Exception as exception:
             pass