Tweak PATH on OS X when Firefox addon is run
Tweak PATH on OS X when Firefox addon is run

kevmoo/travis-build,akoeplinger/travis-build,andyli/travis-build,andyli/travis-build,JuliaCI/travis-build,craigcitro/travis-build,craigcitro/travis-build,akoeplinger/travis-build,JuliaCI/travis-build,kevmoo/travis-build