New
#70
The Classic Theme Restorer add-on is pretty nice and works for me, though it did take me a while to sort out how to set up FF the way I want it.
FF shouldn't need an add-on though. This kind of customizability (to layouts that were in previous versions of FF) should be built in to begin with in my opinion.
At any rate, at least FF 29 is working well for me now.
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Make that: 29.0.1