Find out CSS, javascript, ajax or jquery used for a design on site

[fishy]

I was wondering if there is any way to find out CSS, javascript, ajax or jquery code used for a design on site. When I visit different sites sometimes I like some design, like dropdown menu, sidebar etc. Is there any to get those code of CSS or javascript for that design of a site? I used developer tool addons of mizilla firefox. But i am still wondering if there is more good tools out there.