Rated 3 out of 5 stars
Good and simple addon, but still has some bugs.
1. It opens bookmarks in new tab in background on middle-click (should in foreground)
2. Bookmarks don't have context menus.
I can suggest to hack into browser.xul/browser.js and simply open the same menu that opens from Bookmarks menu on menubar. Button from Toolbar Buttons extension seems to do it this way and currently it's better alternative for me. However installing your small addon would be much better than installing Toolbar Buttons just for ONE button.
And please some link to support section. MozillaZine has forum for support threads: http://forums.mozillazine.org/viewforum.php?f=48
Good luck in development. Will be waiting for updates.