The resident behaviour is just bug #193198, which might suggest that the original problem (which I luckily can no longer reproduce) was somewhere in the interaction between firefox and pango, too. I am not sure that it is really the same problem (my first stacktrace does not involve pango-graphite) so I am not marking this as a duplicate. Feel free to do so if you have reasons to assume it is.
I attach a longer excerpt from .xsession-errors for that crash, in case someone would like to look at it.
The resident behaviour is just bug #193198, which might suggest that the original problem (which I luckily can no longer reproduce) was somewhere in the interaction between firefox and pango, too. I am not sure that it is really the same problem (my first stacktrace does not involve pango-graphite) so I am not marking this as a duplicate. Feel free to do so if you have reasons to assume it is.
I attach a longer excerpt from .xsession-errors for that crash, in case someone would like to look at it.