Tor Browser and Firefox windows share a single icon on Plank (they should not)

Tor Browser and Firefox are both represented by a Firefox logo and it is unified.

So if I have a Firefox window and a Tor Browser window, Plank shows them both as two windows of the same program: one firefox icon with two glowing dots (unlike every other window button panel item that apes Windows 95-Vista). One dot represents an active Firefox window and the other dot represents an active Tor Browser window, but from Plank's perspective, they are they the same.

As someone who may have a Firefox window open to listen to Youtube videos and look up stuff fast while having sessions in Tor Browser to post on message boards, keeping the icons on Plank separate would help greatly.

(X)ubuntu 16.10

Xfwm4 on Gtk2+ 2.32

Plank 0.11.2-1 (Ubuntu's first patched version of upstream 0.11.2)

Xfce desktop

Intel video

X11