CLC-1475 - Travis.ci error: unable to obtain stable firefox connection in 60 seconds

https://jira.media.berkeley.edu/jira/browse/CLC-1475

:warning: **Warning** - Only merge this if the Travis.ci build(s) were successful.
Merge pull request #811 from christianv/CLC-1475-qa

CLC-1475 - Travis.ci error: unable to obtain stable firefox connection in 60 seconds