I've had this come up again in https://treeherder.mozilla.org/jobs?repo=try&tier=1%2C2%2C3&revision=6ca30c7d06dade524e4483bb216358e0fd1865df&selectedTaskRun=WSSmOG8BR7udTIAy96Xgmg.0 Bug 1888556 might be helpful for this
Bug 1866703 Comment 2 Edit History
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I've had this come up again in https://treeherder.mozilla.org/jobs?repo=try&tier=1%2C2%2C3&revision=6ca30c7d06dade524e4483bb216358e0fd1865df&selectedTaskRun=WSSmOG8BR7udTIAy96Xgmg.0 Bug 1888556 might be helpful for this, since the screenshots right now only show a empty desktop screen (so presumably chrome has already shut down)