Detect if a user is in Private Browsing mode

detectPrivateMode.js

function detectPrivateMode(a){var b;if(window.webkitRequestFileSystem)window.webkitRequestFileSystem(window.TEMPORARY,1,function(){b=!1},function(a){b=!0});else if(window.indexedDB&&/Firefox/.test(window.navigator.userAgent)){var c;try{c=window.indexedDB.open("test")}catch(a){b=!0}void 0===b&&t(function(){return"done"===c.readyState},function(a){a||(b=!c.result)})}else if(o(window.navigator.userAgent)){b=!1;try{window.indexedDB||(b=!0)}catch(a){b=!0}}else if(window.localStorage&&/Safari/.test(window.navigator.userAgent)){if(window.safariIncognito)b=!0;else try{window.localStorage.setItem("test",1)}catch(a){b=!0}void 0===b&&(b=!1,window.localStorage.removeItem("test"))}t(function(){return void 0!==b},function(c){a(b)})}