Too simple. Rated 3 out of 5 stars
This Add-On is not doing much.
The only interesting feature is the resize of the bookmark PopUp Window.
I had previously "Add Bookmark here" but this is broken at the moment with Firefox 16, the folders don't expand, so I tried this Add-On.
Unfortunately there is no description and no shortcut field, two of the most important fields I know from Add Bookmarks Here.
So uninstall and waiting for a fix on Add Bookmarks Here :(