strange error in mozilla-firefox under Debian/Sid

["James D. Freels" <freelsjd@comcast.net>]

My i386 system running Debian/Sid is using the current mozilla-firefox
at version 0.9.3-2.  Everything works except at the bottom of the
firefox window is a large rectangle covering the entire width of the
window.  Contained in the lower left of this box (gray background) are
the characters:

      class="t
^

I have disabled about every option (plugins, etc.) and still this shows
up.  Also every web page including a blank page this shows up.  It is
such a nuisance, I cannot use it.

Anyone else seen this before I file a bug report ?

-- 
James D. Freels, Ph.D.
freelsjd@comcast.net
freelsjd@ornl.gov