Rated 4 out of 5 stars

It is a great extension for wide screens. However, it makes a UX issue, especially on notebooks with two finger emulation.
Imagine that you open a new tab on the background. The new tab is not displayed on the screen, because there is not so much space on the screen. If you don't have VertTabBar, you are nofified by FAT (fade ynathing technique): http://q3.cz/images/64ff_tab_highlight.png If you have verttabbat, you are not notified.