Firefox: multiple bookmarks' tab for work, personal, etc

[fa.ce]

I'm looking for a firefox extension that allow me to have and switch between multiple bookmarks tab, one for work, one for personal bookmarks, etc.
In other words i would like to create different bookmarks tab for various activities and switch between them.
Hope is clear ...
Any hints ?

 

[edesignuk]

Can't you just use folders to do this?

 

[fa.ce]

yes i could but i'm looking for a solution that can display ONLY some bookmarks in the tab over the browser window and allow me to switchin another bookmark 'spaces' when needed.
With folder i will have all the bookmarks showed in the same time.