Could you please unplug your webcam/camera, reboot and see if everything works? 
I've noticed that your log files show a message ("cannot set freq 16000 to ep 
0x86") related to a known bug in the Linux kernel (bug #681189, bug #459445, 
bug #884210), unplugging the webcam should fix the bug.
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Potrebbe, per favore, scollegare la sua webcam/macchina fotografica, riavviare 
e vedere se tutto funziona? Ho notato che i Suoi file di log mostrano un 
messaggio ("cannot set freq 16000 to ep 0x86") correlato a un bug noto nel 
kernel di Linux (bug #681189, bug #459445, bug #884210), scollegare la webcam 
dovrebbe impedire all'errore di manifestarsi.

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Title:
  Firefox hangs when opening/closing pages

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