New Tab menu item missing on one installation

I’m using 2.9.1 (v113.10.2) on both my laptop and my desktop computer. I can’t figure why “New Tab” is missing on my desktop. Is this a preference that I’m not seeing?

Are both Macs running Sierra? Tabs are a feature of macOS, so my first guess is that the first screenshot is of a Mac running 10.11 or earlier.


Ah, yes. I didn’t realize that tabs were a Sierra feature. Thanks for your quick response.

Confirmation- it was a Sierra issue.