This bug around the `@mentions` popover and not the address bar suggestion list. So how tab groups are surfaced and shown here (as well as when inserted in the smartbar). At the moment only single tabs are supported.
Bug 2054460 Comment 4 Edit History
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This can work like in the urlbar if we want to match. I think the UX input tab group is was needed for bug 2014499: This bug around the `@mentions` popover and not the address bar suggestion list. So how tab groups are surfaced and shown here (as well as when inserted in the smartbar). At the moment only single tabs are supported.