ナビゲーション:
PDF ファイルを自動表示: By default, Safari opens and displays the content of PDF files found on the Web. Nevertheless, you can disable this behaviour. PDF files will be downloaded.
Safari キャッシュを使用停止: This option allows you to enable or disable the cache of Safari.
戻る/進むボタンを使用: This option allows you to enable and disable the Back and Forward buttons located in Safari's address bar as well as the History menu which appears when the user clicks on these buttons.
シングルウインドウモードを使用: Some Web pages have links opening a new window. This option allows you to open these pages in a new tab.
複数のページを閉じるときに確認: This option allows you to enable or disable the confirmation message which appears when closing multiple windows or a window containing multiple tabs.