I am using a jquery function with .post for logging in.  This function works in Chrome & IE but not firefox.  With firefox I have to try login more than once.  The username & password are cache so I am not typing them each time.  

$('#submit_login').click(function(e){

        $userLogin = $('#user_login_name').val();

        $userPassword = $('#user_password').val();

        //alert("in submit login" + $userLogin );

        $.post("login_ldap.php", {userLogin: $userLogin, userPassword: $userPassword})

                .done(function(data, status){

                        //alert("success");

                        console.log("Data: " + data + '\nStatus: ' + status);

                })

                .fail(function(xhr, textStatus, errorThrown) {

                        alert("Login error");

                        $("#login_error").text("Login Failed").delay(90000).fadeIn();   

                        console.log("The following error occured: "+ xhr.responseText + " textStatus= " + textStatus + " xhr.error=  " + xhr.error + " errorThrown=  " +errorThrown);

                        console.log(e);

                        //$('#login_error').empty().append(xhr.responseText);

                })

                .always(function() {

                        //alert("finished");

                });

         });

login_ldap.php

try {

echo  bricks_usersDB::login_ldap($userLogin, $userPassword);

    }

    catch ( Exception $e ) {

     echo "\nLOGIN ERROR: " . $e->getMessage();

     error_log($e->getMessage());

    # added header to send error back

      header("HTTP/1.0 404 Not Found");

      exit();

    }