Comment 2 for bug 743447

One thing I forgot to throw out there was the case that someone disables the "always show tabbar" option. This will of course make adding a new tab difficult unless the user also adds the new tab button to the toolbar. And if they do add the button to the toolbar it creates the duplicate UI we talked about.

In this case, maybe we detect if the button is in the toolbar and only show the tabbar button if it is not already present? But since this is a conscious decision to change the UI from the recommended config, I don't think these points are a major concern.