diff --git a/widget/windows/nsWindow.cpp b/widget/windows/nsWindow.cpp
index b735e78b1c2f3e0d85a5224311cdc746007c7eac..50f3c6e40b11220b71a8a3811305661887bb4360 100644
--- a/widget/windows/nsWindow.cpp
+++ b/widget/windows/nsWindow.cpp
@@ -165,6 +165,7 @@
 #include "mozilla/StaticPrefs_layout.h"
 #include "mozilla/StaticPrefs_ui.h"
 #include "mozilla/StaticPrefs_widget.h"
+#include "mozilla/StaticPrefs_zen.h"
 #include "nsNativeAppSupportWin.h"
 
 #include "nsIGfxInfo.h"
@@ -1071,7 +1072,7 @@ nsresult nsWindow::Create(nsIWidget* aParent, const LayoutDeviceIntRect& aRect,
 
   if (WinUtils::MicaEnabled() && !IsPopup()) {
     // Enable Mica Alt Material if available.
-    const DWM_SYSTEMBACKDROP_TYPE tabbedWindow = DWMSBT_TABBEDWINDOW;
+    const DWM_SYSTEMBACKDROP_TYPE tabbedWindow = StaticPrefs::zen_widget_windows_acrylic_AtStartup() ? DWMSBT_TRANSIENTWINDOW : DWMSBT_TABBEDWINDOW;
     DwmSetWindowAttribute(mWnd, DWMWA_SYSTEMBACKDROP_TYPE, &tabbedWindow,
                           sizeof tabbedWindow);
   }