If you want to have a beauty firefox in ubuntu os ( and any Gnu/linux distro) , read this small article
1 : first, download this small package ( + )
2 : unzip it (right click , then extract here )
3 : open terminal , then run : sudo gksu nautilus(for Gnome)   or  sudo kdesu konqueror(for KDE)
4 : go to /usr/share/firefox/res
5 : copy all of the files in that package, here
now you can restart firefox
enjoy it
( + ) read this post for more

 

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