--- a/widget/gtk/nsNativeThemeGTK.cpp
+++ b/widget/gtk/nsNativeThemeGTK.cpp
@@ -455,21 +455,18 @@ nsNativeThemeGTK::GetGtkWidgetAndState(S
       }
     }
 
     if (aAppearance == StyleAppearance::MozWindowTitlebar ||
         aAppearance == StyleAppearance::MozWindowTitlebarMaximized ||
         aAppearance == StyleAppearance::MozWindowButtonClose ||
         aAppearance == StyleAppearance::MozWindowButtonMinimize ||
         aAppearance == StyleAppearance::MozWindowButtonMaximize ||
-        aAppearance == StyleAppearance::MozWindowButtonRestore) {
-      aState->backdrop = !nsWindow::GetTopLevelWindowActiveState(aFrame);
-    }
-
-    if (aAppearance == StyleAppearance::ScrollbarbuttonUp ||
+        aAppearance == StyleAppearance::MozWindowButtonRestore ||
+        aAppearance == StyleAppearance::ScrollbarbuttonUp ||
         aAppearance == StyleAppearance::ScrollbarbuttonDown ||
         aAppearance == StyleAppearance::ScrollbarbuttonLeft ||
         aAppearance == StyleAppearance::ScrollbarbuttonRight ||
         aAppearance == StyleAppearance::ScrollbarVertical ||
         aAppearance == StyleAppearance::ScrollbarHorizontal ||
         aAppearance == StyleAppearance::ScrollbartrackHorizontal ||
         aAppearance == StyleAppearance::ScrollbartrackVertical ||
         aAppearance == StyleAppearance::ScrollbarthumbVertical||

--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -7447,50 +7447,8 @@ nsIWidget::CreateTopLevelWindow()
 }
 
 already_AddRefed<nsIWidget>
 nsIWidget::CreateChildWindow()
 {
   nsCOMPtr<nsIWidget> window = new nsWindow();
   return window.forget();
 }
-
-bool
-nsWindow::GetTopLevelWindowActiveState(nsIFrame *aFrame)
-{
-  // Used by window frame and button box rendering. We can end up in here in
-  // the content process when rendering one of these moz styles freely in a
-  // page. Fail in this case, there is no applicable window focus state.
-  if (!XRE_IsParentProcess()) {
-    return false;
-  }
-  // All headless windows are considered active so they are painted.
-  if (gfxPlatform::IsHeadless()) {
-    return true;
-  }
-  // Get the widget. nsIFrame's GetNearestWidget walks up the view chain
-  // until it finds a real window.
-  nsWindow* window = static_cast<nsWindow*>(aFrame->GetNearestWidget());
-  if (!window) {
-    return false;
-  }
-
-  // Get our toplevel nsWindow.
-  if (!window->mIsTopLevel) {
-      GtkWidget *widget = window->GetMozContainerWidget();
-      if (!widget) {
-        return false;
-      }
-
-      GtkWidget *toplevelWidget = gtk_widget_get_toplevel(widget);
-      window = get_window_for_gtk_widget(toplevelWidget);
-      if (!window) {
-        return false;
-      }
-  }
-
-  GtkWidget* widget = window->GetGtkWidget();
-  if (widget) {
-      return !(gtk_widget_get_state_flags(widget) & GTK_STATE_FLAG_BACKDROP);
-  }
-
-  return false;
-}

--- a/widget/gtk/nsWindow.h
+++ b/widget/gtk/nsWindow.h
@@ -423,17 +423,16 @@ public:
     } CSDSupportLevel;
     /**
      * Get the support of Client Side Decoration by checking
      * the XDG_CURRENT_DESKTOP environment variable.
      */
     static CSDSupportLevel GetSystemCSDSupportLevel();
 
     static bool TopLevelWindowUseARGBVisual();
-    static bool GetTopLevelWindowActiveState(nsIFrame *aFrame);
 
 protected:
     virtual ~nsWindow();
 
     // event handling code
     void DispatchActivateEvent(void);
     void DispatchDeactivateEvent(void);
     void DispatchResized();