Rated 5 out of 5 stars

Figured it out!

In this addon's Options, eliminating the checkmark to display labels on hover and selecting multiple rows gives me just what I was looking for to replace Multirow Bookmarks Toolbar - multiple rows and display of each icon's tooltip on hover, with no jumping around of the other icons.

This review is for a previous version of the add-on (1.3.0.1-signed).  This user has a previous review of this add-on.