It works as advertised. Thanks much. My only suggestion is to implement the feature (mentioned by at least one other here) where I have the option to put the button in the location bar.

Exactly what I needed to replace Uppity! Left-click the toolbar button to go up a single item or right-click to select from the full hierarchy.

I like it. I would like to have the option to hide the urlbar icon and simply use the shortcut, if this is possible.