Description of problem:
When displaying large tables, the borders between the cells disappear.  Not all
borders in the table disappear, only some, and the pattern is apparently random.
 I attach a sample HTML file which triggers the problem for us.

Version-Release number of selected component (if applicable):
mozilla-1.7.12-1.4.2
firefox-1.0.7-1.4.3

How reproducible:
Most of the time, but not always.  I can't see any real pattern.  Also, if I
just page up and down in the table, the details may vary.  Borders that were
there at first may disappear when I get back to the same place later, and vice
versa.

Steps to Reproduce:
1. mozilla .../o.html
where o.html is the attached file.
  
Actual results:
Some borders in the table missing.

Expected results:
All borders there.

Additional info:
The size of o.html appears to be close to some limit.  If I remove one or two
rows, I see all borders most, if not all, of the time.

Development Management has reviewed and declined this request.  You may appeal
this decision by reopening this request.