Rated 4 out of 5 stars

Space Saver No Doubt :
This is add-on does exactly what is says, but after installing so many icons Title bar looks shabby. I use this ad-on for displaying tab title in title bar exclusively (Title text is having shadow, if its clear text it would have been better). For placing icons I use add-on "personal menu" (On firefox 4.0.1).

This review is for a previous version of the add-on (1.0.20110330.1-signed.1-signed).