Great work building this extension, but we're experiencing same issue as Mr Himanshu Kumar.
This extension works fine with IE and Chrome, but throws error (fails to render) with Firefox (Edit/View mode).
Also, selected date range defaults to today's date if you navigate to a different page (all browsers) - something that is slightly annoying, especially when it's not easy to open objects in a new tab in Qlik Sense.
Can you please look into it ASAP as it's a must have feature for all our clients.
Firefox version 40.0.3
Chrome version 45.0.2454.99 m