Taskbar unavailable for all windows when video is in full screen mode.

I play videos in full screen mode everyday using Firefox. Recently when I move away from the full screen application to a different open window then the taskbar at the bottom of the screen does not appear. I just attempted to duplicate the issue and take some screenshots only to find that if I'm switching to a second Firefox window the taskbar does not show, but if I switch to a file explorer, or Excel Window then it does show. This makes things very difficult because I'm using the Snipping tool to take screenshots, and the Snipping Tool itself allows the taskbar to display.