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.
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