So there really was an XContentReady not a firering, which caused the problem. I did not add mixin to fire the event:
mixins / ember-prerender.js:
import Ember from 'ember'; export default Ember.Mixin.create({ willComplete: function() { Ember.RSVP.resolve(); }, actions: { didTransition: function() { this._super(); var promises = []; var currentHandlerInfos = this.router.get('router.currentHandlerInfos'); for (var i = 0; i < currentHandlerInfos.length; i++) { if (currentHandlerInfos[i].handler.willComplete) { promises.push(currentHandlerInfos[i].handler.willComplete()); } } Ember.RSVP.all(promises).then(window.prerenderReady);
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