Just what I've been waiting for. Rated 5 out of 5 stars
I really appreciate this extension especially since PageShortcuts and Liink Pad have not been updated.
I use the Multirow Bookmarks Toolbar and I often have several rows of bookmarks filled with mostly temporary or single use bookmarks so this will be a great help to me.
P.S. Keep an eye out for an e-mail from me (so that you don't mark it as junk), I'd like to offer some samples of replacement icons for your toolbar button.