We should add a task to browser/components/payments/test/browser/browser_payment_completion.js (added in bug 1447777) to ensure the front-end isn't accidentally calling window.close() before the DOM timeout. With slow debug builds, there is a chance of a race with even multi-second pref value giving us a false positive.
Priority: -- → P3
Whiteboard: [webpayments] [triage] → [webpayments-reserve]
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