I am using below code to detect dev tool is open or not. It's working fine for chrome but it's not working for Mozilla Firefox. I am using 53.00 version of firefox.
var checkStatus;
var element = new Image();
// var element = document.createElement('any');
element.__defineGetter__('id', function() {
checkStatus = 'on';
});
setInterval(function() {
checkStatus = 'off';
console.log(element);
console.clear();
document.querySelector('#devtool-status').innerHTML = checkStatus;
}, 1000)