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As the other reply to your post assumed, yes, custom CSS. This one to be specific. The dark brown background and white outline around the tab is my doing, everything else is in that CSS. You can make your Firefox look like FF1, 2, 3, 4 and onwards or mix them however you want like I did in the screenshot (personally I keep the overall FF 4-28 design and button size but use the FF1 button icons and no Firefox button like so. I only changed it around for the reply I made above). Everything is configurable.
You're going to LOVE this app then: