diff --git a/widget/gtk/nsWindow.cpp b/widget/gtk/nsWindow.cpp
--- a/widget/gtk/nsWindow.cpp
+++ b/widget/gtk/nsWindow.cpp
@@ -3785,16 +3785,20 @@ nsWindow::Create(nsIWidget* aParent,
             SetCursor(eCursor_standard);
 
             if (aInitData->mNoAutoHide) {
                 gint wmd = ConvertBorderStyles(mBorderStyle);
                 if (wmd != -1)
                   gdk_window_set_decorations(mGdkWindow, (GdkWMDecoration) wmd);
             }
 
+            if (!mIsX11Display) {
+                gtk_widget_set_app_paintable(mShell, TRUE);
+            }
+
             // If the popup ignores mouse events, set an empty input shape.
             if (aInitData->mMouseTransparent) {
               cairo_rectangle_int_t rect = { 0, 0, 0, 0 };
               cairo_region_t *region = cairo_region_create_rectangle(&rect);
 
               gdk_window_input_shape_combine_region(mGdkWindow, region, 0, 0);
               cairo_region_destroy(region);
             }