Re: vertical space Oh you sweet sweet summer child (i kid)

Vertical tabs are the way to go. I use Tree Style Tabs (https://addons.mozilla.org/en-US/firefox/addon/tree-style-ta...) and there is also Tab center, but the experiment has ended (https://testpilot.firefox.com/experiments/tab-center/). You gain a whole tab height in space and only lose a constant amount of horizontal space.

I manage a world where you can read the title of your tab as you open more. Long gone is the world your curiosity is punished! And the in the tree case, you can track where your tabs came from!