Description of problem:
Firefox crashes on some sites. The problem seems related to some fonts, just
before the crash ff prints out this:

(gecko:2883): Pango-WARNING **: failed to create cairo scaled font, expect ugly
output. the offending font is 'Lucida Sans 8.25'

Gdb tells me this (first 13 items from backtrace in attachment):
0x00f1c6bd in nsHTMLReflowState::CalcLineHeight (aPresContext=0xaecb988,
    aRenderingContext=0xaf27138, aFrame=0xaf262ec)
    at nsHTMLReflowState.cpp:2224
2224      aFontMetrics->GetNormalLineHeight(normalLineHeight);

When I don't allow websites to use other fonts then I've defined in the
preferences the websites causing trouble work fine.

Version-Release number of selected component (if applicable):
firefox-2.0.0.9-1.fc8

But ff 2.0.0.8 alsa had the problem. The version that can be downloaded from
mozilla.org works fine.

How reproducible:
Always

Steps to Reproduce:
1. Make sure that you have Lucida Sans installed. It's included in the JVM's
from SUN. When installing the rpms and the compat packages from jpackage these
fonts are also available.
2. Make sure that "Allow pages to use their own fonts ..." is set in the preferences
3. Go to a website using this font. Like my own http://blog.zoeloelip.be
  
Actual results:
Firefox crashes (segmentation fault)

Expected results:
I can view the website!