Not able to register service worker in mozilla 44

 console.log('Service Worker is supported');
 navigator.serviceWorker.register('sw.js').then(function() {
   return navigator.serviceWorker.ready;
 }).then(function(reg) {
   console.log('Service Worker is ready :^)', reg);
   reg.pushManager.subscribe().then(function(sub) {
     console.log('endpoint:', sub.endpoint);
     console.log('Subs id',sub.endpoint.substring(sub.endpoint.lastIndexOf('/')+1,sub.endpoint.length));
       subid =  sub.endpoint.substring(sub.endpoint.lastIndexOf('/')+1,sub.endpoint.length);
   });
 }).catch(function(error) {
   console.log('Service Worker error :^(', error);
 });

 console.log('Push message', event);
 console.log('Check',event.data);
 var title = '123';
 var notification=;

 event.waitUntil(
   self.registration.showNotification(title, {
     'body': '123',
     'icon': 'images/icon.png'
   });

Hi i am trying to implement push notification by the use of service worker. I am able to see push notifications in chrome but i am unable to even register my service worker in mozilla 44. My code to register my service worker : if ('serviceWorker' in navigator) { console.log('Service Worker is supported'); navigator.serviceWorker.register('sw.js').then(function() { return navigator.serviceWorker.ready; }).then(function(reg) { console.log('Service Worker is ready :^)', reg); reg.pushManager.subscribe().then(function(sub) { console.log('endpoint:', sub.endpoint); console.log('Subs id',sub.endpoint.substring(sub.endpoint.lastIndexOf('/')+1,sub.endpoint.length)); subid = sub.endpoint.substring(sub.endpoint.lastIndexOf('/')+1,sub.endpoint.length); }); }).catch(function(error) { console.log('Service Worker error :^(', error); }); } Also, code for service worker push listener : self.addEventListener('push', function(event) { console.log('Push message', event); console.log('Check',event.data); var title = '123'; var notification=''; event.waitUntil( self.registration.showNotification(title, { 'body': '123', 'icon': 'images/icon.png' }); ); }); This is working fine in chrome as i am able to see all my messages in console. But in mozilla none of these messages are shown. Please help me with this?