This seems to have started with the changes from bug 1573133 https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=264937264&searchStr=windows%2C7%2Cdebug%2Cmochitests%2Ctest-windows7-32%2Fdebug-mochitest-browser-chrome-e10s&tochange=d23599eaa057af2ca33ab658e1cb3c9984c6c14c&fromchange=e41dc7906592504c2596f90fc5db06005be7390b Danielle, Johann, could you, please, take a look?
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This seems to have (re)started with the changes from bug 1573133 https://treeherder.mozilla.org/#/jobs?repo=autoland&selectedJob=264937264&searchStr=windows%2C7%2Cdebug%2Cmochitests%2Ctest-windows7-32%2Fdebug-mochitest-browser-chrome-e10s&tochange=d23599eaa057af2ca33ab658e1cb3c9984c6c14c&fromchange=e41dc7906592504c2596f90fc5db06005be7390b Danielle, Johann, could you, please, take a look?