Unfortunately, many teachers have lost data because of an accidentally navigating back, especially with Assignments and will have to reenter data again. So this would be great to confirm that you want to navigate back especially when something that is editable is open.
for example:
Assignments/Assessments/Discussions
Students taking Assessments
Editing Topic Pages
Grading submissions
This would be extremely helpful as it seems in our school no student can get through an exam where questions are listed on multiple pages without clicking the "back" button. This causes headaches for our teachers who are then unable to grade the exam because the student was unable to submit their answers. Or only some answers went through, or a number of other scenarios.