how do i put the tabs on the bottom (of the toolbars)?

how do i put the tabs on the bottom? it makes no sense to why everyone puts them on the top now. but at least there is a way to fix it on firefox.
it doesnt make any sense that there is an option for side tabs but not tabs on the bottom (of the toolbars.)

@boshk,
Are you talking about on Desktop or on mobile?