Screengrab is a Firefox Add-on that is useful for taking web pages as images. It is very useful for bloggers who post screenshots of web pages in posts.
Once you install the extension it adds a small icon in the browser status bar and a link in the right click context menu. You can save or copy webpages as images using screengrab, in either case three options are available complete page/portion, selection or visible portion. Images can be saved as either PNG or JPG.
Supports Firefox 2x and 3x, Download Screengrab