close butten is vanished from the firefox main windows

[siddik]

Binary package hint: firefox-3.0

The Tabs of the firefox window has close button (X) but after closing all tab the remaining one does not have a close tab on top right of the window. what to do with this problem? Is it a bug attack? can you guide me its important.
I am using the 8th version of ubuntu. even i could not up garde it to the new version.

ProblemType: Bug
Architecture: i386
DistroRelease: Ubuntu 8.10
NonfreeKernelModules: wl
Package: firefox-3.0 3.0.3+nobinonly-0ubuntu2
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: firefox-3.0
Uname: Linux 2.6.27-7-generic i686