However i install firefox - via choco install firefox or
https://download.mozilla.org/?product=firefox-latest&os=win64&lang=en-US followed by
./FirefoxSetup.exe -ms /MaintenanceService=false. Any execution thereafter like "C:\Program Files\Mozilla Firefox\firefox.exe" -CreateProfile "TestUser C:\Temp\ffprofiles\TestUser"(take for given that C:\Temp\ffprofiles\TestUser exists) runs, but never returns. See https://travis-ci.org/joma74/inetingishard-floats/jobs/487412867. Also the browser test framework testcafe, which uses firefox in headless mode, never succeeds in opening the browser. See https://travis-ci.org/joma74/inetingishard-floats/jobs/483656442.
P.S. Tested same commands on windows 10, those always execute as expected. Also, the travis ci build under linux - minus the above windows commands of course - succeeds. Also, chrome works as expected in the travis windows environment. Just can not get firefox to work.