Rated 1 out of 5 stars

Locationbar linkifies all parts of a URL path, thus is a generalization of this.

This review is for a previous version of the add-on (1.5). 

Resolved in Navigate Up version 2.0

Navigate Up version 2.0 has a context menu which allows navigation to any part of the URL (higher level URL) - and also to one or two related alternative high level URLs. It also provides a quick way (double-click) to navigate to the root URL.