While searching on the net I have found this plugin. Which adds some aesthetic look your firefox
You need to have Firefox 3.5 and above.
Obviously only for Windows Vista / Windows 7 with Aero Glass enabled!
Just download it and drag it on your firefox screen. a warning will come , after a delay just click on install.
Not compatible with x64 versions of Firefox.
This plugin will not work if you have web developer plugin enabled. Disable that plugin.
Only works fine with the default theme (Strata)