But, if your browser does not support this new API, it uses the - downloads - API instead to save files to disk in the default download folder (asks for downloads permission when opening the interface). Next, you can type the following commands: :q to quit. which will allow you to open the gnome desktop environment's default text editor for editing the grub file once more. Mobaxterm default text editor The procedure is as follows to quit vim/vi text editor: First, you need to switch to command mode.