Stop all broswers from asking to save passwords using an image (MDT)

Question

I work at a university and a professor expressed annoyance at the fact that browsers kept asking if they wanted to save his passwords. He said that there is a way to accomplish this because another university he was at was able to do this. We us microsoft deployment toolkit to image all of our machines, is there a way to remove this feature? All I have found on google is a way to change this on individual user settings, but not system wide. I really want to fix this because he was kind of a jerk about it.