Just happened again. I also noticed there is a new line in dmesg every time it 
happens along the lines of this:
[ 6093.006738] firefox[5745] trap int3 ip:7f12f3d72ae0 sp:7fffc4c04cf0 error:0

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ubuntu-bug tool unsuccessful in opening new tab in Firefox with lp page.
https://bugs.launchpad.net/bugs/440353
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