Update travis CI to test with firefox latest

[juwara0]

This project uses semver, please check the scope of this pr:

• [X] #none# - documentation fixes and/or test additions
• [ ] #patch# - backwards-compatible bug fix
• [ ] #minor# - adding functionality in a backwards-compatible manner
• [ ] #major# - incompatible API change

CHANGELOG

• Updated travis CI to run against firefox latest

[coveralls]

Changes Unknown when pulling ddf696c92a860a5fa45cee3eb3189f72ab7a6db3 on juwara0:firefoxLatest into on ciena-frost:master.

[notmessenger]

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[notmessenger]

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