Ever wanted to change the way Firefox looks? Choose from hundreds of different Firefox skins/themes. https://addons.mozilla.org/en-US/firefox/browse/type:2/cat:all?sort=name
AeroFox Basic 1.9.6 is a theme that sets Firefox to look more like Vista. It fits in a lot better and looks nicer that the original look.

Follow up:

List of Popular Firefox Themes

AeroFox Basic 1.9.6

https://addons.mozilla.org/en-US/firefox/addon/4583

XboxFox

https://addons.mozilla.org/en-US/firefox/addon/6929

gameDeviants 1.5.1

https://addons.mozilla.org/en-US/firefox/addon/6447

Add-ons extend Firefox, letting you personalize your browsing experience. Take a look around and make Firefox your own.