Not just DTA, but FireGestures, Easy DragToGo, and all the amazing extensions that made me stick by Firefox even though most of my colleagues left for Chrome. It is a sad day.
I use DTA! with AntiContainer quite frequently.
Palemoon doesn't (properly) support Tab Groups, so I refuse to use it. The add-on is broken and doesn't restore tabs if the browser crashes.
I feel like my only option is to disable FF updates and hope I never get bit by a security issue. As GNU IceCat doesn't work on my machine. Or learn how to compile from source and maintain my own personal fork...
(And before anyone suggests it, using Aurora/Web Dev version is not an option for me. I've already been there, tried that.)