.
Thread 3 (process 18116):
#0  0xb7fcc410 in __kernel_vsyscall ()
#1  0xb70735a7 in pthread_join () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7edcbe5 in PR_Cleanup () from /usr/lib/libnspr4.so
#3  0xb6f52fce in ?? () from /usr/lib/firefox/libxpcom_core.so
#4  0x08431f80 in ?? ()
#5  0xb7ee13ca in ?? () from /usr/lib/libnspr4.so
#6  0x00000001 in ?? ()
#7  0xb6ea8cf1 in operator delete () from /usr/lib/libstdc++.so.6
#8  0xb5c6c924 in ?? () from /usr/lib/firefox/components/libnecko.so
#9  0x08431f00 in ?? ()
#10 0x00000000 in ?? ()
.
Thread 2 (process 18126):
#0  0xb7fcc410 in __kernel_vsyscall ()
#1  0xb707684c in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb7e50c84 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb7ed5ed3 in PR_LocalTimeParameters () from /usr/lib/libnspr4.so
#4  0xb7ed6d11 in PR_DestroyMonitor () from /usr/lib/libnspr4.so
#5  0xb6f554c6 in ?? () from /usr/lib/firefox/libxpcom_core.so
#6  0x082f6b00 in ?? ()
#7  0x00002710 in ?? ()
#8  0xb43b7378 in ?? ()
#9  0xb6f52c5d in ?? () from /usr/lib/firefox/libxpcom_core.so
#10 0x00000001 in ?? ()
#11 0x082f8628 in ?? ()
#12 0x082f86c0 in ?? ()
#13 0xb6f87940 in ?? () from /usr/lib/firefox/libxpcom_core.so
#14 0x0881bcf0 in ?? ()
#15 0x0881bcfc in ?? ()
#16 0xb43b7398 in ?? ()
#17 0xb6f531cb in ?? () from /usr/lib/firefox/libxpcom_core.so
#18 0x082f8600 in ?? ()
#19 0x00000000 in ?? ()
.
Thread 1 (process 18123):
#0  0xb7fcc410 in __kernel_vsyscall ()
#1  0xb7d9edf0 in raise () from /lib/tls/i686/cmov/libc.so.6
#2  0xb7f052c6 in ?? () from /usr/lib/firefox/libgtkembedmoz.so
#3  0x0000000b in ?? ()
#4  0xb4d85d8c in ?? ()
#5  0x00000000 in ?? ()