Comment 29 for bug 75286

I'm having this problem as well. I've not installed any new extensions, and not upgraded anything that should affect mozilla. I'm still running Feisty (and not able to upgrade this machine for awhile).

The error is:
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GTK Accessibility Module initialized
DOUBLE-CLICK: 400 --> -1 THRESHOLD: 8 --> -1
(Gecko:9062): GLib-GObject-WARNING **: gsignal.c:1019: unable to lookup signal "activate" of unloaded type `MaiAtkObject'

(Gecko:9062): GLib-GObject-CRITICAL **: g_signal_emit_valist: assertion `signal_id > 0' failed
/usr/lib/mozilla-thunderbird/run-mozilla.sh: line 131: 9062 Segmentation fault (core dumped) "$prog" ${1+"$@"}
====

All files in the profile are owned by me, using -safe-mode has no effect.

Starting thunderbird as root (sudo mozilla-thunderbird) does seem to work around the problem, but I've not tested what other side effects this might have.

An strace was 15 meg so I didn't upload it... do you only need the last X number of lines or the whole thing?