$ echo `which firefox`
/usr/local/bin/firefox
41.09s$ npm test
> shield-studies-addon-utils@1.0.0 test /home/travis/build/gregglind/shield-studies-addon-utils
> grunt test && istanbul check-coverage --statements 100 --functions 100 --branches 100 --lines 100 coverage/reports/coverage.json
Running "instrument" task
Instrumented 1 file
Running "shell:jpmTest" (shell) task
JPM [info] Starting jpm test on shield-studies-addon-utils
JPM [info] Creating a new profile
JPM [error] No Firefox binary found at null
JPM [error] Specify a Firefox binary to use with the `-b` flag.
JPM [error] Error: spawn /usr/lib64/firefox ENOENT
/usr/local/bin/firefox