diff --git a/src/contexts/folder-context.tsx b/src/contexts/folder-context.tsx
index 76665e0..3605549 100644
--- a/src/contexts/folder-context.tsx
+++ b/src/contexts/folder-context.tsx
@@ -11,7 +11,7 @@ import {
   type ReactNode,
 } from "react"
 import { toErrorMessage } from "@/lib/app-error"
-import { getFolder, listFolderConversations, closeFolderWindow } from "@/lib/api"
+import { getFolder, listFolderConversations } from "@/lib/api"
 import { isDesktop } from "@/lib/transport"
 import type {
   AgentType,
@@ -196,20 +196,11 @@ export function FolderProvider({
     }
   }, [])
 
-  // Web mode: register this tab's name so that window.open(url, "folder-{id}")
+  // Web mode: register this tab's name so that window.open("", "folder-{id}")
   // from other pages can find and reuse it instead of opening duplicates.
-  // Also notify backend when the folder tab closes.
   useEffect(() => {
     if (isDesktop() || !folderId) return
-
     window.name = `folder-${folderId}`
-
-    const onUnload = () => closeFolderWindow(folderId)
-    window.addEventListener("pagehide", onUnload)
-
-    return () => {
-      window.removeEventListener("pagehide", onUnload)
-    }
   }, [folderId])
 
   const selectConversation = useCallback((id: number, agentType: AgentType) => {
diff --git a/src/lib/api.ts b/src/lib/api.ts
index d968830..a4301f7 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -910,22 +910,12 @@ export async function focusFolderWindow(folderId: number): Promise<void> {
   if (getTransport().isDesktop()) {
     return getTransport().call("focus_folder_window", { folderId })
   }
-  // Web mode: use named window — reuses existing tab if still open,
-  // otherwise opens a new one.
-  window.open(`/folder?id=${folderId}`, `folder-${folderId}`)
-}
-
-/**
- * Notify the backend that a folder tab has been closed.
- * Uses sendBeacon for reliability during page unload.
- */
-export function closeFolderWindow(folderId: number): void {
-  if (getTransport().isDesktop()) return
-  const token = localStorage.getItem("codeg_token") ?? ""
-  navigator.sendBeacon(
-    `/api/close_folder_window?token=${encodeURIComponent(token)}`,
-    JSON.stringify({ folderId }),
-  )
+  // Web mode: open empty string to focus existing named window without reload.
+  // If the window doesn't exist (was closed), open the folder page.
+  const win = window.open("", `folder-${folderId}`)
+  if (!win || win.closed || !win.location.href || win.location.href === "about:blank") {
+    window.open(`/folder?id=${folderId}`, `folder-${folderId}`)
+  }
 }
 
 // Conversation CRUD commands