I just downloaded 1.8rc2 and noticed that when a tab is clicked it retains focus. This leaves the tab looking somewhat ugly with the box around it. Strangely, this only happens in Firefox (3.5.7) but not in IE (8). I know there's a simple work-around - calling this.blur() within a click event handler but it would be nicer if it was done by jQuery UI.

But the show-stopper for me is the fact that the tab widget is still missing a most-needed feature - the ability to scroll to the left or right when more tabs than the container can accommodate are added. I was hoping that would be provided in this release. The current implementation where the new tabs expand the container and jump to the next line may not be appropriate in certain scenarios. Again, there's a workaround albeit not as simple as the first - roll up my own tab plugin!