Firefox just updated today, and forced me to select a "theme". As near as I can tell, every theme makes all of my open tabs look like buttons--no outlines at all until I hover my mouse over them.

I'm sure some graphic artist decided that this was snazzy and minimalist and all that. But it really interfered with my workflow, to the point where I'm debating going to Chromium. I want *tabs*. I want a visual reminder that all of these things are open pages running in my background. Making them all look like buttons was ill-advised and (in my opinion) not smart at all. How do I get my tabs back?