[Bug 1432492] Re: Firefox and Thunderbird freezes entire system after a few seconds of use

[Gizmo Chicken]

Just to expand on (and repeat some of) the above:

(1) I haven't run into this problem (system freeze when running visiting certain sites, including Ubuntu.com, using Firefox) when running bare-metal on my Intel-based laptop or when running bare-metal on my AMD-based desktop; 
(2) The above is highly reproducible (almost ALWAYS happens) in Ubuntu 15.04 VMs run on my Intel-based laptop. (I haven't yet tested any Ubuntu 15.04 VMs on my AMD-based desktop.);
(3) The above is highly reproducible (almost ALWAYS happens) in Ubuntu 15.04 VMs run on my Intel-based laptop, regardless of whether I boot the VM using systemd or upstart ; and
(4)  The above does NOT seem to occur in Ubuntu 14.04.2 VMs run on my Intel-based laptop.

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Title:
  Firefox and Thunderbird freezes entire system after a few seconds of
  use

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