I've had this problem for about 5 weeks, since early december 2013. When I close the lid of the laptop after browsing wit FF, the laptop goes to sleep-mode. When I open it again, FF does not work (open links) or does it terribly slowly. When I close it and restart, a popup says that FF is already running but not responding. Shutting firefox.exe from Task Manager works and I can start it again.

I have read all the threads about this problem and tried every trick given, but to no avail. I would not like to go back to an earlier version. I also have a Lenovo thinkpad and a desktop which do not have this problem. I have tried updating the Samsung, but no updates are available and it hasn't been updated lately, so that can't have caused this.