Description of problem:

When viewing full headers on an email message with large numbers of headers, you
cannot view all of the headers nor read the message as the headers section of
the message always shows up without a scrollbar regardless of the size of the
window.

I marked this as x86 only because thats what I noticed the problem on, this is
likely a problem across all arch's.

Version-Release number of selected component (if applicable):

thunderbird-1.0-1.1.EL4

How reproducible:

Always. It only requires an email with a large number of headers, i.e. messages
from Lotus Notes users.

Steps to Reproduce:
1.Get an email message with lots of headers.
2.Turn on viewing of all headers (View->headers->all)
3.Notice that all you see in the message window are the headers which you cannot
scroll past to see the rest of the headers or read the message.
  
Actual results:

Only the first set of headers show up and completely cover the message window
with no way to scroll through them.

Expected results:

A scrollbar to move through the long list of headers like you have with the
message content.

Additional info:

Workaround: Save the message as a file and open it with your favoriate text
editor or viewer.