It is not fixed. You still cannot disable the tracking via an extension like umatrix.

And no, I do not set the 'do not track' thing. Because that is one more bit of data sent out. To every website. Not just to Mozilla.

Actually more then a computer 'bit' by the way. What percentage of users use the 'do not track' setting? Let's say 1%. Voila. Setting it is worth about 7 bits of data to identify you.