Up Url

works so far + keyboard friendly + goes to top domain

Honestly, what ruins this extension for me (vs. other similar implementations) is that the navigation list is upside-down. When you click the button, the "highest" (farthest-removed) level is at the top and closest to the pointer, while the "lowest" (nearest) level is all the way at the bottom of the list. The shortest distance "up" should also be the shortest distance from the pointer; it's just more natural that way.