I blogged a few weeks ago about a
firefox bug when toggling a tbody tag to display or hide.
When declaring the section to be hidden, I set the tbody tag's display style to "none". When attempting to show the tbody I was setting the display style to "incline" ( I also tried "block" which did not work either).
A co-worker found that simply clearing the display style allows this to function correctly. Internet Explorer works fine with this setting.
So, the lesson learned is - display = 'none' or display = '' will work on both browsers.