Github user prabhjyotsingh commented on the issue:
https://github.com/apache/zeppelin/pull/2816
I understand Selenium, Gecko, WebExtensions are constantly evolving.
However, with this (https://github.com/apache/zeppelin/pull/2826/files), I'm
able to make all the Selenium test case pass on FF-58. This PR is still work in
progress.
Also, there is stuff that will get fixed with FF-59.---
