Laptop acer 6492 with ubuntu operating system since version 14.04, firefox hangs the system tightly every 3-4 days. It starts to transfer large amounts of data, turns the hard drive, the cursor on the screen moves jerkily and then freezes in place. The system does not respond to any keystrokes other than reset. If you manage to close it in time , you can continue working. If you do not have time - after 3-4 hours, it will report that " the script does not respond. Continue?". Why?