On bug 997244 changes for TPSFirefoxRunner have been landed, which have to be backported to aurora and beta. Reason is that TPS is installing mozrunner via PyPI and not directly from the packaged tests. So releasing mozrunner 6.0 break our TPS tests on both branches.
Specifically we will have to backport: https://hg.mozilla.org/mozilla-central/diff/f5d1163268ae/testing/tps/tps/firefoxrunner.py The patch applies cleanly, so I'm going to land those changes for beta and aurora in a bit.
To be on the safe side here, I requested feedback from Andrew first over on bug 997244.
https://hg.mozilla.org/releases/mozilla-aurora/rev/4220f0159e89 I will wait with the backport for beta until the next Aurora build.
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