Video link of issue - https://tdrive.li/HJD0oZ Steps to reproduce the issue: - Connect Laptop to external monitor (extended desktop mode) - Open firefox in the extended screen. - Open an application in original screen in fullscreen mode. - From firefox browser in extended screen share the original screen throufh screen share - Now move to or open another application (Eg:App store) from original screen . In screenshare video , You will see other changes in the screen in only quarter of the screen as in the attached image. Note : This issue is not present in chrome. Browser : Firefox latest browser(70.1) , old browsers too have the issue