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.