Ajax problems with Firefox 86

Question

I have an application using Spring Boot, Bootstrap and jQuery running in Firefox. In the combo there is an ajax call. During the GET request, the screen objects disappear and when the combo returns loaded, the objects continue not to appear.

Below is the ajax code request:

function carregaComboAtivoAjax(url) {
    var uoId = document.getElementById('idUo').value;
    $.ajax({
        type: 'get',
        url: url,
        dataType: 'html',
        data: { uoId: uoId },
        success: function(data) {
            if (data != null) {
                 $("body").html(data);
            }
        }
    });
}

In the image below is what happens in the visual: