Sreengrab Firefox Plugin
I only know Sreengrab Firefox plugin can save entire webpage as images, so I do not need to use computer printscreen to capture the image. You know what I do last time to make screenshoot of whole webpage, I used computer printscreen and modify it using photoshop, since the webpage is too long, I have printscreen few times from the top of the page to the bottom page, and then combine the image together. With Screengrab, it really save my time and work now.