Rated 5 out of 5 stars

grandiose! absolutely a must have when you use treestyletab.
very simple, no option, but you can adjust the vertical position of normal sidebar (bookmarks/history/...) and it remembers it !
another excellent thing : it follows the auto-hide behavior of treestyletab, even in tweaky configurations like mine - 100px permanent, expand to 300px on a 2s mouseover.
Just a little detail : would be neat if the 2s mouseover could be detected also when staying on normal sidebar

This review is for a previous version of the add-on (0.1.2010020601).