What Visual Cue Is Available To Show Safari 14.1’s Tab Bar Is Scrollable?

What visual cue is available to show that Safari 14.1’s tab bar is scrollable?

I understand that I can scroll it when there are too many tabs to fit. Other than trying to scroll it and looking to see whether or not it scrolls, how can I tell whether it is scrollable?

In some cases, the last visible tab may be partially covered, so that’s a tiny cue. In other cases, if the windows size is “just wrong”, all visible tabs are fully rendered.

Is there a cue I’m missing? Is there a cue I can enable? Is there an extension that would provide a cue?