Comment 11 for bug 743447

At the end of the day these are the decisive arguments for me:
 - Button in the tabbar means Back becomes the easy top-left hit target.
 - If other tabbed applications do the same, it increases consistency.
 - Always visible tabbar will increase discoverability.

If the Granite notebook works well, it's key to add this to other applications, and would convince me personally it's the right design. So I suggest to get that tested in the next release.