Rated 4 out of 5 stars

Will occasionally lose the bottom pane if you click the "plus" next to a folder in your bookmarks to expand it. Annoying, but not a deal-breaker. You can get this working with Firefox 3.5 by typing "about:config" in the address bar and then right-clicking and selecting New --> Boolean. Enter "extensions.checkCompatibility" for the preference name and then set it to "false". Good to go!

This review is for a previous version of the add-on (0.5.2009021401).