/opt/firefox$ LD_LIBRARY_PATH=.:/home/felix/local/lib:/usr/X11R6/lib:/usr/X11R6/lib gdb ./firefox-bin 
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This GDB was configured as "i486-slackware-linux"...(no debugging symbols found)
Using host libthread_db library "/lib/tls/libthread_db.so.1".

(gdb) run
Starting program: /opt/firefox/firefox-bin 
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[Thread debugging using libthread_db enabled]
[New Thread -1221196096 (LWP 31280)]
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---Type <return> to continue, or q <return> to quit---
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[New Thread -1221649488 (LWP 31283)]
[New Thread -1230128208 (LWP 31284)]
[New Thread -1244283984 (LWP 31285)]
[New Thread -1253196880 (LWP 31286)]
[New Thread -1261585488 (LWP 31287)]
Detaching after fork from child process 31288.
[New Thread -1271923792 (LWP 31289)]
[New Thread -1280312400 (LWP 31290)]
[Thread -1280312400 (LWP 31290) exited]
[New Thread -1288701008 (LWP 31291)]
[Thread -1288701008 (LWP 31291) exited]
[New Thread -1288701008 (LWP 31292)]
[New Thread -1280312400 (LWP 31293)]
[Thread -1288701008 (LWP 31292) exited]
[New Thread -1288701008 (LWP 31294)]
[Thread -1288701008 (LWP 31294) exited]
[New Thread -1288701008 (LWP 31305)]
[New Thread -1322402896 (LWP 31306)]
[Thread -1322402896 (zombie) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1221196096 (LWP 31280)]
0xb238df3e in ?? ()
(gdb) bt
#0  0xb238df3e in ?? ()
#1  0x08d81050 in ?? ()
#2  0xb298ff60 in ?? ()
#3  0xbfdc3760 in ?? ()
#4  0xb294912c in ?? ()
#5  0x00000000 in ?? ()
#6  0xb298ff60 in ?? ()
#7  0xbfdc3790 in ?? ()
#8  0xb239fa92 in ?? ()
#9  0xb298ff60 in ?? ()
#10 0x00000001 in ?? ()
#11 0x00000001 in ?? ()
#12 0xb7487e90 in __unregister_atfork () from /lib/tls/libc.so.6
Previous frame inner to this frame (corrupt stack?)
(gdb)