Firefox leaving unclosable window behind when moved to another screen.
Firefox is leaving behind a small window/artifact that cannot be closed through task manager. You can move any other application such at outlook or even a chrome browser to hide the window, but it will stay on top of any Firefox window that is placed on that monitor. I have disabled and enabled use of GPU, and ran a refresh from the troubleshooting section. He is running Inspiron 15 3511 windows 10. Any other ideas out there? See attached picture.