Github user mephi42 commented on the issue:
https://github.com/apache/zeppelin/pull/2816
@zjffdu I'm currently trying to stabilize them on my local machine. There
are still a couple things that need debugging - the worst one being that
sometimes click() on e.g. Login button produces no effect.
@felixcheung, to me this is a useful safeguard when running locally and new
Firefox is by accident in $PATH.---
