The latest update (version 22) of Firefox on Android included a switch to the full tablet UI on 7-inch tablets like the Nexus 7. I find this to be a change for the worse; previously, hitting the tab button resulted in the window scrolling almost all the way down the screen, giving room for 6 tabs stacked vertically and plenty of space to read the full title of each tab. In contrast, the new UI only shows 3 tabs aligned horizontally along the top of the screen, and most titles are too long to fit on screen and are thus truncated.

Is there a way to revert to the old, phone, UI on my tablet? Perhaps a setting in about:config?