Web notifications only work in Firefox

I have this extremely simple code to test the functionality

Notification.requestPermission();
new Notification("DGD");

I opened this on 2 devices with Firefox, Chrome, Opera and android browser (7 browsers total), it worked on firefox on both devices and none of the other browsers. Refreshed about a million times and cleared all caches and data. Looking at the browser compatibility it should be working on those browsers (latest versions).

Do you spot where the problem is?

via Chebli Mohamed