I changed my mouse pointer color to the DMZ-Black cursor theme via the command
sudo update-alternatives --config x-cursor-theme and at first it appeared that I got the expected results. However, I soon noticed that when I moved the pointer over Firefox, it turned back to what appears to be DMZ-White. Further testing produced the same result in Google Chrome, and all the Libre-office apps. I also noticed it changing from a black pointer to a white hand in Ubuntu Software Center when I pointed at listed applications there.
I'm using Ubuntu 14.04.5 with Unity DE