I like the idea of the find bar that looks like the one in Firefox. It's a nice feature.
One thing I don't like about it is how it totally ignores the current look and feel. It has always that ugly gray gradient in the background. Please at least use the window background color of the look and feel as the base of the gradient if it has to be a gradient at all. And the text field should be a text field and not some gray area with a line border.
P.S.: I'm on a Windows XP machine here. So I'm used to some ugliness, but the Mac users will probably have a nervous breakdown when they see it ;)