First of all, I believe this to be a brilliant addition. I am currently testing it out on Firefox Beta, which I have as my default browser.

For me, there is a serious flaw that makes it less than perfect. In order for this extension to be really useful, I must be able to move links to a folder, preferably within the app, but at the very least by adding a folder or link to a folder within Bookmark Toolbar.

If this is not clear to you, please contact me.

Clean and fast, love that it uses existing bookmarks, exactly what I was looking for.
Unfortunately missing one critical feature to upgrade to 5 stars, needs the ability to open folder/bookmark in container.
It would also be nice to have Thumbnails or Icons as preview but that is not a deal breaker.

Pretty good job!