推荐一个火狐插件：

ruwind

https://addons.mozilla.org/zh-CN/firefox/addon/1146/

Screengrab! saves webpages as images...

It will capture what you can see in the window, the entire page, just a selection, a particular frame... basically it saves webpages as images - either to a file, or to the clipboard. It captures Flash too!

lrxrwc

抓网页的，看看。