Incognito Browser Mode Detection Script

Companies that make browsers make incognito modes better every time someone figures a way to detect incognito mode.  It's a vicious circle, one that will keep you researching the newest hack every time they thwart your desire to detect incognito mode.

Why bother?

V/r,

^ _ ^

What are you hoping to accomplish? There might be another way to test what you want to test or protect your site if we better understand your situation.

If you wanted to detect Chrome, you could use this to detect the FileSystemAPI which is disabled in incognito mode and use that. If you are trying to go after a particular browser instead of an OS that could help us too because the ways to detect at times could be browser specific and not OS specific:

var fs = window.RequestFileSystem || window.webkitRequestFileSystem;

if (!fs) {

  console.log("check failed?");

} else {

  fs(window.TEMPORARY,

     100,

     console.log.bind(console, "not in incognito mode"),

     console.log.bind(console, "incognito mode"));

}