[Tracking Requested - why for this release]: As outlined in comment 3, we're the only browser shipping the update, and it breaks a common date format hack. Even though WebDevs are technically wrong on this one, we can't risk this turning into a similar incident than bug 1806042.
Bug 1864612 Comment 4 Edit History
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[Tracking Requested - why for this release]: As outlined in comment 3, we're the only browser shipping the update, and it breaks a common date format hack. Even though WebDevs are technically wrong on this one, we can't risk this turning into a similar incident to bug 1806042.