I did some re-triggers and it still seems to fail permanently on [mozilla-beta](https://treeherder.mozilla.org/jobs?repo=mozilla-beta&group_state=expanded&selectedTaskRun=CH7sLUfVQpuae5oyEZyOKw.0&resultStatus=testfailed%2Cbusted%2Cexception&searchStr=en-us&revision=540bb2110afc9220037e299ac96652952841c640) whereby it's all fine on [mozilla-central](https://treeherder.mozilla.org/jobs?repo=mozilla-central&searchStr=en-US).
Bug 1740021 Comment 6 Edit History
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I did some re-triggers and it still seems to fail permanently on [mozilla-beta](https://treeherder.mozilla.org/jobs?repo=mozilla-beta&group_state=expanded&resultStatus=success%2Ctestfailed%2Cbusted%2Cexception&tier=2&fromchange=47a81c65b4c3d0cc590b95c692e3ba12ce02bbe1&searchStr=en-us) whereby it's all fine on [mozilla-central](https://treeherder.mozilla.org/jobs?repo=mozilla-central&searchStr=en-US).