the firefox chashes when i navigate or change the tab page

[Bourne17]

Binary package hint: firefox-3.0

i don't know why, but when i navigate to the internet, or change the tab the Firefox close. that is since I update to 3.0.8 version

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
Package: firefox-3.0 3.0.8+nobinonly-0ubuntu0.8.10.2
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=es_DO.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.27-11-generic i686