Here All-Glass Firefox, a nice add-on for Mozilla Firefox made by Ambroos, which brings to your browser Vista Aero Glass effect !
 
Once installed, this add-on gives transparency to Firefox toolbar, menu bar, navigation bar, personal bar and tabs.

Read the whole article

Just installed Firefox 3, and this looks pretty good A few minor bits, but barely noticeable.
 
Now, not only can I avoid IE, but Firefox doesn't look quite so bad either.

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