normal ambiance for unity Ubuntu 12.04. however the corners are now squared up for a crisper look.
The theme is called new ambiance and needs to be selected through myunity or similar external application.
New 2.0 includes the squarer GTK 3 theme.
Firefox tabs are due to theme gtk native add-on
due to limitations in ubuntu the highlight of file names is still rounded.
next to change will be the close, maximise, minimise buttons
4 years ago
2.0: new GTK edges