How to enable CORS on Firefox?

Question

Can somebody please tell me how I allow CORS on firefox? I easily managed it on Chrome and IE, but I am totally failing at it with Firefox. I edited the following about:conf

Answer 1

Very often you have no option to setup the sending server so what I did I changed the XMLHttpRequest.open call in my javascript to a local get-file.php file where I have the following code in it:

javascript is doing this:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    // File content is now in the this.responseText
  }
};
xhttp.open("GET", "get-file.php?url=http://site/file", true);
xhttp.send();

In my case this solved the restriction/situation just perfectly. No need to hack Firefox or servers. Just load your javascript/html file with that small php file into the server and you're done.