Why doesn't jQuery remove the class on Joomla 3.3?

Question

JavaScript

Hello. There is a site on Joomla 3.3, in which some menu items are anchors that link to one page. There is a script that adds a class and highlights the active link (anchor), respectively, when you switch to another anchor, the class is removed and added to another anchor. The problem is that on a test page (not on Joomla), the same script works perfectly. On the site, removeClass does not work. Could there be a problem in Joomla? If not, how to get around it?
Here is the code:

jQuery(document).ready(function(){
$('.menu').click(function(){
$('.menu').removeClass('active');
$(this).addClass('active' );
return false;
});

Answer 1

Is there anything additionally connected to the mootools type on the site? They conflict with JQ.
There are no errors in the code itself. If naturally the class "menu" is present for each menu item, and not for their wrapper.