Question

The event is not working in firefox mobile for android.

How do I detect the orientation change after all?

Answer 1

Firefox for Android does not support the orientationchange event but you can achieve the same result by using media query listeners.

var mqOrientation = window.matchMedia("(orientation: portrait)");

// The Listener will fire whenever this either matches or ceases to match
mqOrientation.addListener(function() { self.handleViewportChange(); });