This is following Bug 1674666. I suspect that the test is failing pretty early due to `ensureVideosReady()` failing to resolve.
Bug 1743134 Comment 1 Edit History
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This is following Bug 1674666. I suspect that the test is failing pretty early due to `ensureVideosReady()` failing to resolve. https://searchfox.org/mozilla-central/source/toolkit/components/pictureinpicture/tests/browser_keyboardShortcutClosePIP.js#17