In Web applications, the common way of uploading files to a web server is through the submission of a form. However, you might come into some scenarios where you might need to upload files via Ajax. This tutorial will show you how. The following list shows the browser support for Ajax. Opera 7.6 and above. Mozilla Firefox 1.0 and above. Apple Safari 1.2 and above. Netscape version 7.1 and above.