nice idea, serious bug Rated 2 out of 5 stars
(using FF 3.6.12)
Unfortunately, this extension has a pretty serious bug that's a deal-breaker for me. If I center-click on several (Bookmarks Toolbar) links in quick succession, some of them open as the "new tab" URL instead of the desired link. This bug has been mentioned in other reviews for quite some time, and evidently it has never been fixed.
For now, I guess I can use the New Tab Homepage extension instead. Too bad...