--- a/widget/gtk/nsColorPicker.cpp
+++ b/widget/gtk/nsColorPicker.cpp
@@ -65,21 +65,19 @@ NS_IMETHODIMP nsColorPicker::Open(nsICol
     return NS_ERROR_FAILURE;
   }
   mCallback = aColorPickerShownCallback;
 
   nsXPIDLCString title;
   title.Adopt(ToNewUTF8String(mTitle));
   GtkWidget *color_chooser = gtk_color_selection_dialog_new(title);
 
-  GtkWindow *window = GTK_WINDOW(color_chooser);
-  gtk_window_set_modal(window, TRUE);
-
   GtkWindow *parent_window = GTK_WINDOW(mParentWidget->GetNativeData(NS_NATIVE_SHELLWIDGET));
   if (parent_window) {
+    GtkWindow *window = GTK_WINDOW(color_chooser);
     gtk_window_set_transient_for(window, parent_window);
     gtk_window_set_destroy_with_parent(window, TRUE);
   }
 
   gtk_color_selection_set_current_color(
       GTK_COLOR_SELECTION(gtk_color_selection_dialog_get_color_selection(
         GTK_COLOR_SELECTION_DIALOG(color_chooser))),
       &mDefaultColor);