What would you recommend to make removeClass and addClass work in firefox?

Question

JavaScript

This construction $('li.active').removeClass('active'); does not work.
$(this).addClass('active');

i.e. the active class is not removed and the active class is not added. There are no problems in other browsers, the problem is only with firefox, but the task needs to be done only on mozilla. Thanks in advance

Answer 1

Everything worked, just a newer version of jQuery had to be connected.