Many might come from `SimpleTest.promiseFocus` waiting for the focus event on the document instead of window: https://searchfox.org/mozilla-central/rev/387160feb07b75ae76bfc12df035a10f58d25168/testing/mochitest/tests/SimpleTest/SimpleTest.js#1021
Bug 1959973 Comment 13 Edit History
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Many might come from - `SimpleTest.promiseFocus` waiting for the focus event on the document instead of window: https://searchfox.org/mozilla-central/rev/387160feb07b75ae76bfc12df035a10f58d25168/testing/mochitest/tests/SimpleTest/SimpleTest.js#1021 - `SpecialPowers.ensureFocus` does the same: https://searchfox.org/mozilla-central/rev/387160feb07b75ae76bfc12df035a10f58d25168/testing/specialpowers/content/SpecialPowersChild.sys.mjs#289