For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Methods$().tab
Activates a tab element and content container. Tab should have either a data-target or an href targeting a container node in the DOM.
<script>
$(function(){
$('#myTab a:last').tab('show');
})
</script>
>>> document.id('group45').getParent().id
"group-tab2"