It sounds like the core of the problem is compiz (your window manager)
refusing to draw other windows while it is waiting for firefox to
update.
Please give the output of:
cat /etc/lsb-release
and try doing
apport-collect 728017
on the laptop again, which hopefully will give us more info about what's going
on with compiz.
** Also affects: firefox
Importance: Undecided
Status: New
** Package changed: openssh (Ubuntu) => compiz (Ubuntu)
** Also affects: openssh (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/728017
Title:
xwindows over ssh causes instability
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