Open up the Address Book. There are columns: Name | Email | Work Phone | Organization ^ Click between Email and Work Phone and drag to the right. You should expect the Email Columns to extend to the right. What happens is: The Name Columns extends to the right making the Email column even smaller. The same thing happens when clicking between the other columns. It only works correctly with the first one.
Confirmed with 2001-12-15-08 under W2K. In the future, please try to state your Mozilla build ID in your bug reports or use Bugzilla Helper: http://ftp.mozilla.org/pub/mozilla/nightly/latest/
Probably not the same, but vaguely related: bug 49499 Also, this might be fixed very soon by: bug 73868
*** This bug has been marked as a duplicate of 111859 ***
111859 - bookmark 95872 - mail/news i think. and the same prob exists in chatzilla too. umm, this is probably infact a dup of bug bug 95872