diff --git a/src/mono/browser/runtime/loader/config.ts b/src/mono/browser/runtime/loader/config.ts
index f882b2b1e192ea..9de5c7bb26c2be 100644
--- a/src/mono/browser/runtime/loader/config.ts
+++ b/src/mono/browser/runtime/loader/config.ts
@@ -216,15 +216,6 @@ export function normalizeConfig () {
         config.environmentVariables!["LANG"] = `${config.applicationCulture}.UTF-8`;
     }
 
-    if (config.debugLevel !== 0 && globalThis.window?.document?.querySelector("script[src*='aspnetcore-browser-refresh']")) {
-        if (!config.environmentVariables["DOTNET_MODIFIABLE_ASSEMBLIES"]) {
-            config.environmentVariables["DOTNET_MODIFIABLE_ASSEMBLIES"] = "debug";
-        }
-        if (!config.environmentVariables["__ASPNETCORE_BROWSER_TOOLS"]) {
-            config.environmentVariables["__ASPNETCORE_BROWSER_TOOLS"] = "true";
-        }
-    }
-
     runtimeHelpers.diagnosticTracing = loaderHelpers.diagnosticTracing = !!config.diagnosticTracing;
     runtimeHelpers.waitForDebugger = config.waitForDebugger;