Apologies if this has been already addressed/discussed elsewhere. Please refer.
Issue: Every time a test is run, WPTdriver complains “Error instrumenting browser” and fails the test. Pressing the “Re-run the test” button, opens FF on the test machine, runs the test just fine but the site displays the Repeat View only.
Test machine: Server 2003
Browser: FF 36.0.1
WPTdriver.ini:
[Firefox]
exe=“C:\Program Files\Mozilla Firefox\firefox.exe”
options=‘-profile “%PROFILE%” -no-remote’
installer=http://www.webpagetest.org/installers/browsers/firefox.dat
template=firefox
Thanks for your time and assistance.