Hi, the Firefox view is a hidden tab, and it was excluded from tab multi-selection for that reason in bug 1790593 (although there's a bug with that implementation, see bug 1792017).
Bug 1798706 Comment 4 Edit History
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Hi, the Firefox view tab is a hidden tab, and it was excluded from tab multi-selection for that reason in bug 1790593 (although there's a bug with that implementation, see bug 1792017).