Split tabs but vertically

[Salomon]

Would be lovely to be able to use the split tabs (dev feature) but vertically for vertical monitors.

[Makoto]

Split View with top-bottom splitting

Currently, Split View only supports side-by-side splitting; I would like the option to switch to a top-and-bottom split as well.

[Jon]

(Note: similar ideas have been merged into this thread)

[lrbailey58]

I was just about to post about this and this post appeared. If I'm splitscreening firefox with another application, I want my firefox split tabs to appear vertically!