Seems like I'll be sticking to an obsolete version of Firefox in the future so I can keep the real TileTabs extension and not this... neutered version.
I do not want multiple windows open having to close them one by one when switching programs or whatever reason.
Shame on Firefox Devs or whoever decided this was a good idea, this stuff is what killed opera and many other great apps and programs in the past. Will they ever learn.

I'll keep using TileTABS on an old Firefox version.