I also notice this problem in Firefox, going to Ctrl+Alt+F2 and running "killall firefox" (if the system is awake enough to run the command), seems to fix it until Firefox freezes the system again.
I also notice this problem in Firefox, going to Ctrl+Alt+F2 and running "killall firefox" (if the system is awake enough to run the command), seems to fix it until Firefox freezes the system again.