Description of problem:   
Firefox crashes with SIGFPE when visiting 
http://docs.python.org/ref/yield.html , caused by attempt to divide by zero, 
when latest  
gtk2/pango/cairo is installed from rawhide. The zero   
value is in the lineHeight variable in nsFontMetricsPango::CacheFontMetrics. 
Backtrace attached.   
   
Version-Release number of selected component (if applicable):   
firefox-1.0.4-5  
   
How reproducible:   
Always 
   
Steps to Reproduce:   
1. firefox 'http://docs.python.org/ref/yield.html' 
     
Actual results:   
<snip> 
/usr/lib/firefox-1.0.4/run-mozilla.sh: line 159: 14390 Floating point 
exception"$prog" ${1+"$@"} 
   
Expected results:   
No crash 
   
Additional info: 
All latest updates from rawhide installed. 
Workaround: Run firefox with 
MOZ_DISABLE_PANGO=1 firefox