Let's say that you have multiple firefox windows open. What you see happen is an additional arrow points to it's icon in the launcher. However, if you double click the icon, it displays all of the windows in a spread out fashion, similar to the behaviour from pushing Super + W, but only for that program group.
Is it possible to make this window spreading behaviour occur with alt-tab?
PS: No idea what tags I should use, or if the language (jargon) in the title or question is appropriate.