diff --git a/electron/preload/index.ts b/electron/preload/index.ts
index 0136fcf1..1d91f9a3 100644
--- a/electron/preload/index.ts
+++ b/electron/preload/index.ts
@@ -41,10 +41,15 @@ contextBridge.exposeInMainWorld('electronAPI', {
   hideWebView: (id: string) => ipcRenderer.invoke('hide-webview', id),
   changeViewSize: (id: string, size: Size) => ipcRenderer.invoke('change-view-size', id, size),
   onWebviewNavigated: (callback: (id: string, url: string) => void) => {
+    const channel = 'webview-navigated'
     const listener = (event: any, id: string, url: string) => callback(id, url);
-    ipcRenderer.on('webview-navigated', listener);
+    ipcRenderer.on(channel, listener);
+    console.log(`[preload] add ${channel}; count=${ipcRenderer.listenerCount(channel)}`)
     // Return cleanup function to remove listener
-    return () => ipcRenderer.off('webview-navigated', listener);
+    return () => {
+      ipcRenderer.off(channel, listener);
+      console.log(`[preload] remove ${channel}; count=${ipcRenderer.listenerCount(channel)}`)
+    };
   },
   showWebview: (id: string) => ipcRenderer.invoke('show-webview', id),
   getActiveWebview: () => ipcRenderer.invoke('get-active-webview'),
@@ -197,4 +202,4 @@ window.onmessage = (ev) => {
   ev.data.payload === 'removeLoading' && removeLoading()
 }
 
-setTimeout(removeLoading, 4999)
\ No newline at end of file
+setTimeout(removeLoading, 4999)