Description of problem:
When browsing some pages like "www.msn.com" and "www.microsoft.com",the source window displays whole source in few line(less than 5 line).

Version-Release number of selected component (if applicable):
firefox-3.0.5-1.el5_2

How reproducible:
Always

Steps to Reproduce:
1.Load "www.msn.com"
2.Press "Ctrl+U" 

  
Actual results:
The source window displays whole source of "www.msn.com" in only one line.

Expected results:
The source window displays page source in thansand lines

Additional info:
The attachment is the screanshot.

The source window display some pages incorrectly:
www.msn.com
jp.msn.com
www.microsoft.com
But it works fine for most other pages:
www.yahoo.com
www.sohu.com

The situation is the same as firefox in Fedora9 and seamonkey in RHEL4.