try: -b o -p win64 -u mochitest-e10s-bc[Windows 8],mochitest-e10s-devtools-chrome[Windows 8] -t none --rebuild 10

Source: hg.mozilla.org --- Sunday, April 30, 2017
changeset 08cccb19cafc branch bookmark tag user Gerald Squelart description try: -b o -p win64 -u mochitest-e10s-bc[Windows 8],mochitest-e10s-devtools-chrome[Windows 8] -t none --rebuild 10 MozReview-Commit-ID: 969I553FOM4 files ...

from Windows http://ift.tt/2qutlnT