Why did you change the design, because Firefox 31 looks bad? Please go back to the earlier design layout.
Why do engineers feel they need to make everything "better"? I liked the previous versions, I don't like this version. You force change like a totalitarion government. If you insist on this ugly design, there should be an option to convert. This is similar to the Gnome 3.0 problem, but at least they have given conversion plugins.
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Keazen oplossing
Many of us are using Classic Theme Restorer (Customize Australis) {web link} Restore squared tabs, appmenu, add-ons bar, small button view and more on Australis UI (Windows/MacOSX/Linux + Fx 29+).
This will restore many of the things the last upgrade took away.