How to show fullscreen preview in GIMP?

Thanks to this post I have a workaround for the lack (or hiddenness) of preview feature in GIMP. Full screen mode can be used for this. You can set it up so that it has different set of GUI options from windowed mode. Configure it as follows.

1. Go to Edit→Preferences→Image Windows→Appearance.
2. Uncheck all the checkboxes in the Default Appearance in Fullscreen Mode section.
3. Set background mode & color to your preference for preview.
4. Press OK and restart GIMP to actually apply the defaults.

Now, after you press F11 followed by Tab, you'll be in preview mode without toolbars (which are toggled by Tab). To fit the image to screen, press Ctrl+Shift+J.