I recently upgraded my Kubuntu system from 18.04 to 18.10. An issue that I've been experiencing since the upgrade has been that Firefox 63.0 has started becoming unresponsive after resuming the system from a suspend. Once the system resume, the area of the screen that was taken up by Firefox becomes completely black and moving it around does not change anything. I've had to force quit the application ever single time I've resumed the system.
I've attempted running Firefox in safe mode before suspending, reinstalling Firefox both with apt remove and apt remove --purge. None of those have fixed it.
I am on kernel 4.18, using nVidia 396.54.09 and Firefox 63.0.
Any help would be appreciated. Thanks.