Usability Rated 4 out of 5 stars

This is a good idea, and makes fullscreen browsing easier. By good I mean that one of the flaws with the Bookmarks Toolbar has been lack of keyboard accelerations, you can't even TAB to it from the address bar...

Two options that I think would make your addon GREAT would be:

1. An ability to change the root (my bookmark ontology is kept in Bookmarks Toolbar, except the Unsorted).

2. An option to open bookmark in New Tab

#2 being pretty essential in my opinion, as the user must CTRL-T/N before opening the bookmark. I notice pressing CTRL-ENTER on an item will not perform similarly in the context menu (or toolbar) as the Bookmarks Sidebar, making this an unexpected point of frustration.

Nice work, I hope you consider my niche ideas!

This review is for a previous version of the add-on (1.4).