I am experiencing the same Firefox (53.0.2) behavior as well, on three occasions now. I was then able to get a few lines from /var/log/kern.log before the whole laptop got unresponsive and I had to switch it off with the power button.
** Attachment added: "kernel panic info from /var/log/kern.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1689538/+attachment/4875205/+files/total_crash_2+3.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1689538 Title: Firefox hangs then 17.04 won't shutdown and misbehaves To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1689538/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
