Tracking for Fission mochitests (M4.1) Regressed-by nsFocusManager::SetFocus bug 1556627 has been fixed, so we might be able to re-enable this test for Fission now.
Bug 1613031 Comment 2 Edit History
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Tracking for Fission mochitests (M4.1) nsFocusManager::SetFocus bug 1556627 regressed and disabled this test for Fission, so we now need to fix and re-enable it.