php – AJAX request works on all browsers except Firefox

Question:

I've been trying to do an AJAX upload system and it works perfectly in Chrome, however it doesn't work in firefox. I used JQuery's $.ajax() function. Do you have any suggestions for what it might be?

I have a normal form that requires a file and AJAX makes a PDF Viewer appear, like:

$.ajax({
  url: 'url.php',
  method: 'POST',
  data: dados,
  success: function(data) {
    $("#mensagem").append(data);
}
})

And I don't understand why in firefox it doesn't work.

Answer:

Use the following code, where I edited "method" to "type":

$.ajax({
        type: "POST",
        url: "url.php",
        data: dados,
        success: function(data){
                                $("#mensagem").append(data);  
                 }
});