Rated 5 out of 5 stars
Nice add-on just 2 things seem off.
1 Auto hide wont work (got another add-on for that anyway.) https://addons.mozilla.org/en-US/firefox/addon/hide-bookmarksbar/?src=search
2 When placing buttons on the bookmark-bar they don't show, However when the bookmark-bar is right below the tab bar AND there is something taking up space on the left side of the tab-bar, The buttons from the bookmark-bar show in that space(on hiding the bookmark-bar the the "something" shows).
It's not a bug it's a feature !, at least to me ;-)
2 complaints about not working for AutoHide.
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Be sure to fix it.