can you attach a minimized testcase via "Create a new attachment" or publish a working page on the Net ? This will ease reproducability.
Your example is wrong, the proper display for a tr is table-row, see http://www.w3.org/TR/CSS2/visuren.html#propdef-display You can workaround the bug in IE by setting display="" which works in both browsers. Invalid.
Reopening. While using 'table-row' would indeed lead to better behavior, the fact that the space keeps growing is a bug in Mozilla.