Firefox dumped core.
Created attachment 444940 [details] emerge --info
Created attachment 444942 [details] gdb backtrace
Created attachment 444944 [details] emerge --info
If you feel I have closed your bug and it is still a current issue, please reopen and update it completely. We will not work bugs that have no ebuild in tree any longer or can not be reproduced with a current system. Thank You for your support and understanding The Mozilla Team
No problem. I haven't had a repeat anyway so it may have been a fluke and/or been fixed by now.