Ideas
While students who click on another tab are given a warning that their teacher will be notified, if a student opens two windows and places them side by side, they can cheat have notes open on the screen without having to click between tabs. I have caught a few students using this workaround to try to cheat.
Would it be possible on the backend to have the window take over the entire screen on the screen so that students are only able to see Extempore?
Another possible solution would. be to require that the entire screen along w/ video is recorded during student responses.