ports/68344: firefox 0.9_4 : crash at startup! how to debug?

[regisr]

>Number:         68344
>Category:       ports
>Synopsis:       firefox 0.9_4 : crash at startup! how to debug?
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Jun 25 21:00:44 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     regisr
>Release:        FreeBSD 4.10-STABLE
>Organization:
>Environment:
FreeBSD crocoite.home.regix.com 4.10-STABLE FreeBSD 4.10-STABLE #87: Mon Jun  7 21:00:15 CEST 2004     regisr at crocoite.home.regix.com:/usr/obj/usr/src/sys/CROCOITE  i386
>Description:
      %firefox
Segmentation fault

No other message... 
I tried without plugins too. 
firefox 0.8_5 is working. How can I find why? Compiled from the ports gcc 2.95.4 perl  v5.8.4 built for i386-freebsd-64int
>How-To-Repeat:
      launch firefox ;-)
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: