Synchronous XMLHttpRequest on the main thread is deprecated

ajax, firefox, javascript, jquery

Solution

Using jQuery to append a script tag to the document will cause it to load the script with async:false and trigger this warning.

As in:

var script = $("<script></script>");
script.attr("src", player.basepath + "whatever.js");
$(document.body).append(script);

Problem

Why has this message suddenly started to appear in the Firefox console? I'm using JQuery 1.7.1. What in my app could I be doing that has caused this message to start appearing?

Original source