Rename title of Facebook web page

function retitlize() {
    var url_type = 0; // 0 home; 1 profile; 2 watch; 3 group;
    var title = '';

    if (window.location.pathname == '/') url_type = 0;
    if (window.location.pathname.split('/').length-2 == 1) url_type = 1;
    if (window.location.pathname.indexOf('watch') !== -1) url_type = 2;
    if (window.location.pathname.indexOf('groups') !== -1) url_type = 3;

    if (url_type == 2) title = $('#watch_feed .n1l5q3vz .d2edcug0').eq(0)[0].innerText;
    console.log(title);

    if (title !== '')
        $('title').html(title + ' | Facebook')
}