@Override
        protected void detachSectionElement(TableSectionElement section) {
            if (isGecko192OrBefore()) {
                return;
            }
            super.detachSectionElement(section);
        }
Firefox 3.6 and earlier convert td elements to divs if the tbody is
removed from the table element.
stroom-core-client-widget/src/main/java/com/google/gwt/user/cellview/client/AbstractCellTable.java