How to detect if you are in Incognito mode in Google Chrome with JavaScript

    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"));
    }

credit: https://stackoverflow.com/a/27805491/20110298

https://ourcodeworld.com/articles/read/805/how-to-detect-if-you-are-in-incognito-mode-with-javascript-in-google-chrome

https://ourcodeworld.com/author/sdkcarlos