code: public void setSafariBuiltinFavorites() {
      File[] files = app.listFiles(new FilenameFilter() {
        @Override
        public boolean accept(File dir, String name) {
          return name.startsWith("BuiltinFavorites") && name.endsWith(".plist");
        }
      });
      for (File plist : files) {
        setSafariBuiltinFavories(plist);
      }
    }
docs: Modifies the BuiltinFavorites....plist in safariCopies/safari.app to contain only "about:blank"