this is or could be an excellent replacement for my multirow bookmarks toolbar.

Unfortunately it's currently unusable for me, because it shows the bookmarks menu instead of the toolbar folder.

This may be reasonable and may be I change to this later.
But in general I think not everyone wants to see all the bookmarks from the menu on the page.
I used the toolbar for my main bookmarks and the menu to save groups of bookmarks for different reasons.

A simple solution would be to add a folder setting and display this folder on the page.

Another suggestion would be to only show the items in a folder like a menu (like in the toolbar). I have really many items in a bookmarks folder, so a hierarchical menu would help a lot.

I noticed, you can collapse a folder with a double click.
Could you add an option to start with all folders collapsed?
Also a single click would be sufficient, because there is no other action.

would be nice if you add possibility in options to disable that annoying "Delete it ????" window

Excellent you need the URL shortener to stop text overflow.