Better tabs management in Safari 6.x

I'm looking for extensions to allow the Safari 6.x versions to manage a large number of open tabs better than the current implementation. In particular I'm looking for two features: 1. *Vertical tabs*. This is possible in Firefox by means of the extension Tree Style Tab . 2. *App tabs*. In Firefox it is possible to pin tabs as _app tabs_. Up to know I've found and tried several times SafariStand but it doesn't look great and it doesn't provide the features of _Tree Style Tab_. I would really like to move from Firefox to Safari, but for the problem of "I have too many useful extensions in Firefox." :) Has anyone discovered extensions that add these features to Safari for OS X?