Requests for dark tabs and headers are tracked here:
Neither is technically possible atm, afaik.
Dark window title is possible (though you are the first one to ask for it).
Thanks Martin. Now I know where the tracker located.
Yes, just hope have a solution on that in the near future. Regarding the window title I think just only me prefer to not having any light background on my screen else will need an click-through-able overlay to dim it.