Yeah, I do mine on the right, and keep the browser on my right-hand monitor, so the list of tabs is way at one side of my view. It's worked really well for me.

Yeah, in Firefox I've been really happy with Tree-Style Tabs on the right hand side.

Exactly what I am doing. Tabs on the right on the right-hand monitor on Mac (which has window controls on the left). They never get in the way, basically I only see them when I am going to use them.

Same here, using Tree-Style Tabs on Firefox. I’m on a Mac and would like to use Safari but it has no support for tabs down the side - impossible to go back.