Firefox presents strange lateral band while displayng an XML with XSL

[Cosma Bello]

Binary package hint: firefox-3.5

While displaying an XML, FF display it well only the first time. If I hit F5 (refresh), window remains the same size, but useful frame restrict so that there is a vertical band on the right, and an horizontal one on the bottom. In this 'new' area sometimes is black, sometimes you can see the contens of other firefox tab, as if the area is transparent, sometimes strange figures, like when graphic board is damaged. When this happens, even the vertical scroll bar is moved from right of the window to the right of the 'reduced frame'.

To verify if it is an X problem, or a video driver problem, I installed Kazehacase, and it works like a charm on the same XML file, so I think it's firefox problem

Attached there are XML and XSL that create the problem, and a snapshot of FF behaviour

ProblemType: Bug
Architecture: amd64
Date: Thu Dec 16 10:12:51 2010
DistroRelease: Ubuntu 9.10
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
Package: firefox 3.6.13+build3+nobinonly-0ubuntu0.9.10.1
ProcEnviron:
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-22.69-generic
SourcePackage: firefox-3.5
Uname: Linux 2.6.31-22-generic x86_64